How to upgrade from Ubuntu 18.04 LTS to Ubuntu 20.04 LTS

Good day! Any Idea about this issue?

root@prod:~# sudo do-release-upgrade
Checking for a new Ubuntu release
Get:1 Upgrade tool signature [1554 B]
Get:2 Upgrade tool [1342 kB]
Fetched 1344 kB in 0s (0 B/s)
authenticate 'focal.tar.gz' against 'focal.tar.gz.gpg'
extracting 'focal.tar.gz'
[screen is terminating]
root@prod:~# sudo do-release-upgrade -d
Checking for a new Ubuntu release
There is no development version of an LTS available.
To upgrade to the latest non-LTS develoment release
set Prompt=normal in /etc/update-manager/release-upgrades.
root@prod:~# sudo apt update
Hit:1 https://repos.insights.digitalocean.com/apt/do-agent main InRelease
Hit:2 http://security.ubuntu.com/ubuntu bionic-security InRelease
Hit:3 http://archive.ubuntu.com/ubuntu bionic InRelease
Hit:4 http://ppa.launchpad.net/certbot/certbot/ubuntu bionic InRelease
Hit:5 http://mirrors.digitalocean.com/ubuntu bionic InRelease
Ign:6 https://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.6 InRelease
Hit:7 https://deb.nodesource.com/node_10.x bionic InRelease
Hit:8 http://ppa.launchpad.net/ondrej/php/ubuntu bionic InRelease
Hit:9 http://mirrors.digitalocean.com/ubuntu bionic-updates InRelease



Reading cache

Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done
Hit https://repos.insights.digitalocean.com/apt/do-agent main InRelease
Hit http://mirrors.digitalocean.com/ubuntu bionic InRelease
Hit http://archive.ubuntu.com/ubuntu bionic InRelease
Hit http://ppa.launchpad.net/certbot/certbot/ubuntu bionic InRelease
Ign https://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.6 InRelease
Hit https://deb.nodesource.com/node_10.x bionic InRelease
Hit http://ppa.launchpad.net/ondrej/php/ubuntu bionic InRelease
Hit http://mirrors.digitalocean.com/ubuntu bionic-updates InRelease
Hit http://mirrors.digitalocean.com/ubuntu bionic-backports InRelease
Hit https://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.6 Release
Hit http://security.ubuntu.com/ubuntu bionic-security InRelease
Fetched 0 B in 0s (0 B/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done

Checking for installed snaps

Calculating snap size requirements
No candidate ver:  linux-image-4.15.0-126-generic
No candidate ver:  linux-modules-4.15.0-126-generic

Updating repository information

Third party sources disabled

Some third party entries in your sources.list were disabled. You can
re-enable them after the upgrade with the 'software-properties' tool
or your package manager.

To continue please press [ENTER]

Get:1 http://security.ubuntu.com/ubuntu focal-security InRelease [114 kB]
Get:2 http://archive.ubuntu.com/ubuntu focal InRelease [265 kB]
Get:3 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages [1480 kB]
Get:4 http://archive.ubuntu.com/ubuntu focal/universe amd64 Packages [8628 kB]
Get:5 http://security.ubuntu.com/ubuntu focal-security/main Translation-en [255 kB]
Get:6 http://security.ubuntu.com/ubuntu focal-security/main amd64 c-n-f Metadata [10.4 kB]
Get:7 http://security.ubuntu.com/ubuntu focal-security/restricted amd64 Packages [938 kB]
Get:8 http://security.ubuntu.com/ubuntu focal-security/restricted Translation-en [134 kB]
Get:9 http://security.ubuntu.com/ubuntu focal-security/restricted amd64 c-n-f Metadata [520 B]
Get:10 http://security.ubuntu.com/ubuntu focal-security/universe amd64 Packages [703 kB]
Get:11 http://security.ubuntu.com/ubuntu focal-security/universe Translation-en [126 kB]
Get:12 http://security.ubuntu.com/ubuntu focal-security/universe amd64 c-n-f Metadata [14.4 kB]
Get:13 http://security.ubuntu.com/ubuntu focal-security/multiverse amd64 Packages [22.2 kB]
Get:14 http://security.ubuntu.com/ubuntu focal-security/multiverse Translation-en [5376 B]
Get:15 http://security.ubuntu.com/ubuntu focal-security/multiverse amd64 c-n-f Metadata [512 B]
Get:16 http://archive.ubuntu.com/ubuntu focal/universe Translation-en [5124 kB]
Get:17 http://archive.ubuntu.com/ubuntu focal/universe amd64 c-n-f Metadata [265 kB]
Fetched 18.1 MB in 0s (0 B/s)

Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done

Invalid package information

After updating your package information, the essential package
'ubuntu-minimal' could not be located. This may be because you have
no official mirrors listed in your software sources, or because of
excessive load on the mirror you are using. See /etc/apt/sources.list
for the current list of configured software sources.
In the case of an overloaded mirror, you may want to try the upgrade
again later.


Restoring original system state

Aborting
      g package lists... 2%
*** Collecting problem information

The collected information can be sent to the developers to improve the
application. This might take a few minutes.
Reading package lists... Done
Building dependency tree
Reading state information... Done
.
=== Command terminated with exit status 1 (Sun May 29 02:41:07 2022) ===