How to clear login message: 1 updates could not be installed automatically.

Hi, I followed this article (https://www.digitalocean.com/community/tutorials/how-to-upgrade-to-ubuntu-20-04-focal-fossa) to upgrade my droplet from Ubuntu 18.04 Ubuntu 20.04. Everything was smooth without surprise.

However, when I log into the system after the upgrade. The login message has a line:

1 updates could not be installed automatically. For more details,
see /var/log/unattended-upgrades/unattended-upgrades.log

The full log is here:

2022-02-01 15:50:54,107 INFO Initial blacklisted packages: 
2022-02-01 15:50:54,108 INFO Initial whitelisted packages: 
2022-02-01 15:50:54,108 INFO Starting unattended upgrades script
2022-02-01 15:50:54,108 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-02 06:11:56,339 INFO Initial blacklisted packages: 
2022-02-02 06:11:56,340 INFO Initial whitelisted packages: 
2022-02-02 06:11:56,340 INFO Starting unattended upgrades script
2022-02-02 06:11:56,340 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-02 06:12:01,538 INFO Packages that will be upgraded: 
2022-02-02 16:46:10,587 INFO Initial blacklisted packages: 
2022-02-02 16:46:10,588 INFO Initial whitelisted packages: 
2022-02-02 16:46:10,589 INFO Starting unattended upgrades script
2022-02-02 16:46:10,589 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-03 06:38:06,887 INFO Initial blacklisted packages: 
2022-02-03 06:38:06,888 INFO Initial whitelisted packages: 
2022-02-03 06:38:06,889 INFO Starting unattended upgrades script
2022-02-03 06:38:06,889 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-03 06:38:14,126 INFO Packages that will be upgraded: linux-generic linux-headers-generic linux-headers-virtual linux-image-generic linux-image-virtual linux-libc-dev linux-virtual
2022-02-03 06:38:14,127 INFO Writing dpkg log to /var/log/unattended-upgrades/unattended-upgrades-dpkg.log
2022-02-03 06:39:06,791 INFO All upgrades installed
2022-02-03 16:34:20,476 INFO Initial blacklisted packages: 
2022-02-03 16:34:20,477 INFO Initial whitelisted packages: 
2022-02-03 16:34:20,477 INFO Starting unattended upgrades script
2022-02-03 16:34:20,477 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-04 01:47:57,251 INFO Initial blacklisted packages: 
2022-02-04 01:47:57,252 INFO Initial whitelisted packages: 
2022-02-04 01:47:57,252 INFO Starting unattended upgrades script
2022-02-04 01:47:57,252 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-04 06:46:55,944 INFO Initial blacklisted packages: 
2022-02-04 06:46:55,945 INFO Initial whitelisted packages: 
2022-02-04 06:46:55,946 INFO Starting unattended upgrades script
2022-02-04 06:46:55,946 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-04 06:47:03,321 INFO Removing unused kernel packages: linux-modules-4.15.0-163-generic linux-headers-4.15.0-163 linux-headers-4.15.0-163-generic linux-modules-extra-4.15.0-163-generic linux-image-4.15.0-163-generic
2022-02-04 06:47:19,411 INFO Packages that were successfully auto-removed: linux-headers-4.15.0-163 linux-headers-4.15.0-163-generic linux-image-4.15.0-163-generic linux-modules-4.15.0-163-generic linux-modules-extra-4.15.0-163-generic
2022-02-04 06:47:19,411 INFO Packages that are kept back: 
2022-02-04 06:47:20,237 INFO Packages that will be upgraded: libmysqlclient20
2022-02-04 06:47:20,238 INFO Writing dpkg log to /var/log/unattended-upgrades/unattended-upgrades-dpkg.log
2022-02-04 06:47:25,791 INFO All upgrades installed
2022-02-05 04:11:28,693 INFO Initial blacklisted packages: 
2022-02-05 04:11:28,694 INFO Initial whitelisted packages: 
2022-02-05 04:11:28,694 INFO Starting unattended upgrades script
2022-02-05 04:11:28,695 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-05 06:20:41,329 INFO Initial blacklisted packages: 
2022-02-05 06:20:41,330 INFO Initial whitelisted packages: 
2022-02-05 06:20:41,330 INFO Starting unattended upgrades script
2022-02-05 06:20:41,331 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-05 06:20:47,254 INFO Packages that will be upgraded: 
2022-02-06 06:14:21,637 INFO Initial blacklisted packages: 
2022-02-06 06:14:21,638 INFO Initial whitelisted packages: 
2022-02-06 06:14:21,638 INFO Starting unattended upgrades script
2022-02-06 06:14:21,639 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-06 06:14:26,702 INFO Packages that will be upgraded: 
2022-02-06 13:22:57,193 INFO Initial blacklisted packages: 
2022-02-06 13:22:57,194 INFO Initial whitelisted packages: 
2022-02-06 13:22:57,194 INFO Starting unattended upgrades script
2022-02-06 13:22:57,194 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-07 00:06:19,163 INFO Initial blacklisted packages: 
2022-02-07 00:06:19,165 INFO Initial whitelisted packages: 
2022-02-07 00:06:19,165 INFO Starting unattended upgrades script
2022-02-07 00:06:19,165 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-07 06:08:59,829 INFO Initial blacklisted packages: 
2022-02-07 06:08:59,830 INFO Initial whitelisted packages: 
2022-02-07 06:08:59,830 INFO Starting unattended upgrades script
2022-02-07 06:08:59,830 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-07 06:09:05,320 INFO Packages that will be upgraded: 
2022-02-08 01:38:54,600 INFO Initial blacklisted packages: 
2022-02-08 01:38:54,602 INFO Initial whitelisted packages: 
2022-02-08 01:38:54,602 INFO Starting unattended upgrades script
2022-02-08 01:38:54,602 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-08 06:57:01,427 INFO Initial blacklisted packages: 
2022-02-08 06:57:01,428 INFO Initial whitelisted packages: 
2022-02-08 06:57:01,428 INFO Starting unattended upgrades script
2022-02-08 06:57:01,428 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-08 06:57:06,835 INFO Packages that will be upgraded: 
2022-02-09 06:12:17,781 INFO Initial blacklisted packages: 
2022-02-09 06:12:17,783 INFO Initial whitelisted packages: 
2022-02-09 06:12:17,783 INFO Starting unattended upgrades script
2022-02-09 06:12:17,783 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-09 06:12:23,128 INFO Packages that will be upgraded: 
2022-02-09 12:51:53,710 INFO Initial blacklisted packages: 
2022-02-09 12:51:53,712 INFO Initial whitelisted packages: 
2022-02-09 12:51:53,712 INFO Starting unattended upgrades script
2022-02-09 12:51:53,712 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-10 03:57:51,134 INFO Initial blacklisted packages: 
2022-02-10 03:57:51,135 INFO Initial whitelisted packages: 
2022-02-10 03:57:51,135 INFO Starting unattended upgrades script
2022-02-10 03:57:51,136 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-10 06:46:48,122 INFO Initial blacklisted packages: 
2022-02-10 06:46:48,124 INFO Initial whitelisted packages: 
2022-02-10 06:46:48,124 INFO Starting unattended upgrades script
2022-02-10 06:46:48,124 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-10 06:46:52,819 INFO Packages that will be upgraded: 
2022-02-11 05:13:52,815 INFO Initial blacklisted packages: 
2022-02-11 05:13:52,817 INFO Initial whitelisted packages: 
2022-02-11 05:13:52,817 INFO Starting unattended upgrades script
2022-02-11 05:13:52,817 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-11 06:24:35,811 INFO Initial blacklisted packages: 
2022-02-11 06:24:35,813 INFO Initial whitelisted packages: 
2022-02-11 06:24:35,813 INFO Starting unattended upgrades script
2022-02-11 06:24:35,813 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-11 06:24:40,868 INFO Packages that will be upgraded: 
2022-02-12 06:08:41,547 INFO Initial blacklisted packages: 
2022-02-12 06:08:41,548 INFO Initial whitelisted packages: 
2022-02-12 06:08:41,548 INFO Starting unattended upgrades script
2022-02-12 06:08:41,548 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-12 06:08:46,111 INFO Packages that will be upgraded: 
2022-02-12 08:20:50,720 INFO Initial blacklisted packages: 
2022-02-12 08:20:50,721 INFO Initial whitelisted packages: 
2022-02-12 08:20:50,721 INFO Starting unattended upgrades script
2022-02-12 08:20:50,721 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-13 03:54:35,184 INFO Initial blacklisted packages: 
2022-02-13 03:54:35,186 INFO Initial whitelisted packages: 
2022-02-13 03:54:35,186 INFO Starting unattended upgrades script
2022-02-13 03:54:35,187 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-13 06:51:35,048 INFO Initial blacklisted packages: 
2022-02-13 06:51:35,049 INFO Initial whitelisted packages: 
2022-02-13 06:51:35,049 INFO Starting unattended upgrades script
2022-02-13 06:51:35,049 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-13 06:51:39,854 INFO Packages that will be upgraded: 
2022-02-14 06:36:08,067 INFO Initial blacklisted packages: 
2022-02-14 06:36:08,069 INFO Initial whitelisted packages: 
2022-02-14 06:36:08,069 INFO Starting unattended upgrades script
2022-02-14 06:36:08,069 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-14 06:36:12,594 INFO Packages that will be upgraded: 
2022-02-14 17:14:58,347 INFO Initial blacklisted packages: 
2022-02-14 17:14:58,348 INFO Initial whitelisted packages: 
2022-02-14 17:14:58,348 INFO Starting unattended upgrades script
2022-02-14 17:14:58,349 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-15 06:53:26,764 INFO Initial blacklisted packages: 
2022-02-15 06:53:26,766 INFO Initial whitelisted packages: 
2022-02-15 06:53:26,766 INFO Starting unattended upgrades script
2022-02-15 06:53:26,766 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-15 06:53:31,581 INFO Packages that will be upgraded: 
2022-02-15 13:27:36,052 INFO Initial blacklisted packages: 
2022-02-15 13:27:36,053 INFO Initial whitelisted packages: 
2022-02-15 13:27:36,053 INFO Starting unattended upgrades script
2022-02-15 13:27:36,053 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-16 02:24:35,607 INFO Initial blacklisted packages: 
2022-02-16 02:24:35,608 INFO Initial whitelisted packages: 
2022-02-16 02:24:35,609 INFO Starting unattended upgrades script
2022-02-16 02:24:35,609 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-16 06:10:01,571 INFO Initial blacklisted packages: 
2022-02-16 06:10:01,572 INFO Initial whitelisted packages: 
2022-02-16 06:10:01,572 INFO Starting unattended upgrades script
2022-02-16 06:10:01,572 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-16 06:10:07,720 INFO Packages that will be upgraded: 
2022-02-17 06:40:26,748 INFO Initial blacklisted packages: 
2022-02-17 06:40:26,749 INFO Initial whitelisted packages: 
2022-02-17 06:40:26,749 INFO Starting unattended upgrades script
2022-02-17 06:40:26,749 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-17 06:40:31,304 INFO Packages that will be upgraded: 
2022-02-17 11:29:02,347 INFO Initial blacklisted packages: 
2022-02-17 11:29:02,348 INFO Initial whitelisted packages: 
2022-02-17 11:29:02,349 INFO Starting unattended upgrades script
2022-02-17 11:29:02,349 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-18 03:52:38,417 INFO Initial blacklisted packages: 
2022-02-18 03:52:38,419 INFO Initial whitelisted packages: 
2022-02-18 03:52:38,419 INFO Starting unattended upgrades script
2022-02-18 03:52:38,419 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-18 06:56:01,743 INFO Initial blacklisted packages: 
2022-02-18 06:56:01,745 INFO Initial whitelisted packages: 
2022-02-18 06:56:01,745 INFO Starting unattended upgrades script
2022-02-18 06:56:01,745 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-18 06:56:08,934 INFO Packages that will be upgraded: snapd ubuntu-core-launcher
2022-02-18 06:56:08,934 INFO Writing dpkg log to /var/log/unattended-upgrades/unattended-upgrades-dpkg.log
2022-02-18 06:56:24,635 INFO All upgrades installed
2022-02-19 06:14:08,569 INFO Initial blacklisted packages: 
2022-02-19 06:14:08,571 INFO Initial whitelisted packages: 
2022-02-19 06:14:08,571 INFO Starting unattended upgrades script
2022-02-19 06:14:08,571 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-19 06:14:13,927 INFO Packages that will be upgraded: 
2022-02-19 16:59:28,305 INFO Initial blacklisted packages: 
2022-02-19 16:59:28,306 INFO Initial whitelisted packages: 
2022-02-19 16:59:28,306 INFO Starting unattended upgrades script
2022-02-19 16:59:28,306 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-20 05:50:25,814 INFO Initial blacklisted packages: 
2022-02-20 05:50:25,816 INFO Initial whitelisted packages: 
2022-02-20 05:50:25,816 INFO Starting unattended upgrades script
2022-02-20 05:50:25,816 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-20 06:05:13,359 INFO Initial blacklisted packages: 
2022-02-20 06:05:13,360 INFO Initial whitelisted packages: 
2022-02-20 06:05:13,360 INFO Starting unattended upgrades script
2022-02-20 06:05:13,360 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-20 06:05:19,450 INFO Packages that will be upgraded: snapd ubuntu-core-launcher
2022-02-20 06:05:19,450 INFO Writing dpkg log to /var/log/unattended-upgrades/unattended-upgrades-dpkg.log
2022-02-20 06:05:33,233 INFO All upgrades installed
2022-02-21 06:17:04,856 INFO Initial blacklisted packages: 
2022-02-21 06:17:04,857 INFO Initial whitelisted packages: 
2022-02-21 06:17:04,858 INFO Starting unattended upgrades script
2022-02-21 06:17:04,858 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-21 06:17:09,546 INFO Packages that will be upgraded: 
2022-02-21 08:41:26,848 INFO Initial blacklisted packages: 
2022-02-21 08:41:26,850 INFO Initial whitelisted packages: 
2022-02-21 08:41:26,850 INFO Starting unattended upgrades script
2022-02-21 08:41:26,850 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security
2022-02-22 01:26:28,607 INFO Initial blacklisted packages: 
2022-02-22 01:26:28,609 INFO Initial whitelisted packages: 
2022-02-22 01:26:28,609 INFO Starting unattended upgrades script
2022-02-22 01:26:28,609 INFO Allowed origins are: o=Ubuntu,a=bionic, o=Ubuntu,a=bionic-security, o=UbuntuESMApps,a=bionic-apps-security, o=UbuntuESM,a=bionic-infra-security

Tried to search online without results. Anyone could give me a hint on why this message? and how should I clear it?

Thanks very much!