Let's Encrypt ACMEv1 protocol. You should upgrade to an ACMEv2

I can’t see acme-v02.api.letsencrypt.org, even when I run sudo /etc/letsencrypt/acme.sh --upgrade -b dev, and the results are:

[Fri Jan 24 01:09:30 UTC 2020] Already uptodate! [Fri Jan 24 01:09:30 UTC 2020] Upgrade success!

I’m on Ubuntu 16.04.2 LTS (GNU/Linux 4.4.0-150-generic x86_64). When I use: sudo apt-get update sudo apt-get install –only-upgrade certbot

I get: Reading package lists… Done Building dependency tree Reading state information… Done certbot is already the newest version (0.31.0-1+ubuntu16.04.1+certbot+1). The following packages were automatically installed and are no longer required: letsencrypt linux-headers-4.4.0-141 linux-headers-4.4.0-141-generic linux-headers-4.4.0-142 linux-headers-4.4.0-142-generic linux-headers-4.4.0-143 linux-headers-4.4.0-143-generic linux-headers-4.4.0-145 linux-headers-4.4.0-145-generic linux-headers-4.4.0-148 linux-headers-4.4.0-148-generic linux-headers-4.4.0-151 linux-headers-4.4.0-151-generic linux-headers-4.4.0-154 linux-headers-4.4.0-154-generic linux-headers-4.4.0-157 linux-headers-4.4.0-157-generic linux-headers-4.4.0-159 linux-headers-4.4.0-159-generic linux-headers-4.4.0-161 linux-headers-4.4.0-161-generic linux-headers-4.4.0-164 linux-headers-4.4.0-164-generic linux-headers-4.4.0-165 linux-headers-4.4.0-165-generic linux-headers-4.4.0-72 linux-headers-4.4.0-72-generic linux-headers-4.4.0-75 linux-headers-4.4.0-75-generic linux-headers-4.4.0-78 linux-headers-4.4.0-78-generic linux-headers-4.4.0-79 linux-headers-4.4.0-79-generic linux-headers-4.4.0-81 linux-headers-4.4.0-81-generic linux-headers-4.4.0-83 linux-headers-4.4.0-83-generic linux-headers-4.4.0-87 linux-headers-4.4.0-87-generic linux-headers-4.4.0-89 linux-headers-4.4.0-89-generic linux-headers-4.4.0-91 linux-headers-4.4.0-91-generic linux-headers-4.4.0-92 linux-headers-4.4.0-92-generic linux-headers-4.4.0-93 linux-headers-4.4.0-93-generic linux-image-4.4.0-141-generic linux-image-4.4.0-142-generic linux-image-4.4.0-143-generic linux-image-4.4.0-145-generic linux-image-4.4.0-148-generic linux-image-4.4.0-151-generic linux-image-4.4.0-154-generic linux-image-4.4.0-157-generic linux-image-4.4.0-159-generic linux-image-4.4.0-161-generic linux-image-4.4.0-164-generic linux-image-4.4.0-165-generic linux-image-4.4.0-72-generic linux-image-4.4.0-75-generic linux-image-4.4.0-78-generic linux-image-4.4.0-79-generic linux-image-4.4.0-81-generic linux-image-4.4.0-83-generic linux-image-4.4.0-87-generic linux-image-4.4.0-89-generic linux-image-4.4.0-91-generic linux-image-4.4.0-92-generic linux-image-4.4.0-93-generic linux-modules-4.4.0-143-generic linux-modules-4.4.0-145-generic linux-modules-4.4.0-148-generic linux-modules-4.4.0-151-generic linux-modules-4.4.0-154-generic linux-modules-4.4.0-157-generic linux-modules-4.4.0-159-generic linux-modules-4.4.0-161-generic linux-modules-4.4.0-164-generic linux-modules-4.4.0-165-generic python-acme python-augeas python-cffi-backend python-chardet python-configargparse python-configobj python-cryptography python-dialog python-enum34 python-funcsigs python-idna python-ipaddress python-mock python-ndg-httpsclient python-openssl python-parsedatetime python-pbr python-pkg-resources python-psutil python-pyasn1 python-pyicu python-requests python-rfc3339 python-six python-tz python-urllib3 python-zope.component python-zope.event python-zope.hookable python-zope.interface Use ‘sudo apt autoremove’ to remove them. The following packages will be upgraded: systemd-sysv 1 upgraded, 0 newly installed, 0 to remove and 200 not upgraded. 1 not fully installed or removed. Need to get 0 B/12.0 kB of archives. After this operation, 1,024 B of additional disk space will be used. (Reading database … 758379 files and directories currently installed.) Preparing to unpack …/systemd-sysv_229-4ubuntu21.27_amd64.deb … Unpacking systemd-sysv (229-4ubuntu21.27) over (229-4ubuntu21.21) … dpkg: unrecoverable fatal error, aborting: fork failed: Cannot allocate memory E: Sub-process /usr/bin/dpkg returned an error code (2)

Any advice?