I've been stuck for a little while on this one. Basically, I have a server running 20.04.6, and I've been trying to upgrade it to the current LTS. The only issue is that do-release-upgrade is removing the official Ubuntu sources from the apt sources list, and then refuses to proceed with the upgrade, as it can't find its essential packages.
Here's the relevant content of my /etc/apt/sources.list file:
:~# cat /etc/apt/sources.list | grep -v ^$ | grep -v ^#
deb http://ftp.ubuntu.com/ubuntu focal main restricted
deb http://ftp.ubuntu.com/ubuntu focal-updates main restricted
deb http://ftp.ubuntu.com/ubuntu focal universe
deb http://ftp.ubuntu.com/ubuntu focal-updates universe
deb http://ftp.ubuntu.com/ubuntu focal multiverse
deb http://ftp.ubuntu.com/ubuntu focal-updates multiverse
deb http://ftp.ubuntu.com/ubuntu focal-backports main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu focal-security main restricted
deb http://security.ubuntu.com/ubuntu focal-security universe
deb http://security.ubuntu.com/ubuntu focal-security multiverse
And when I run an apt update, I properly get this:
:~# apt update
Hit:1 http://ppa.launchpad.net/ondrej/apache2/ubuntu focal InRelease
Hit:2 http://ftp.ubuntu.com/ubuntu focal InRelease
Get:3 http://ftp.ubuntu.com/ubuntu focal-updates InRelease [114 kB]
Get:4 http://ftp.ubuntu.com/ubuntu focal-backports InRelease [108 kB]
Get:5 http://security.ubuntu.com/ubuntu focal-security InRelease [114 kB]
Hit:6 https://esm.ubuntu.com/apps/ubuntu focal-apps-security InRelease
Hit:7 https://esm.ubuntu.com/apps/ubuntu focal-apps-updates InRelease
Hit:8 https://esm.ubuntu.com/infra/ubuntu focal-infra-security InRelease
Hit:9 https://esm.ubuntu.com/infra/ubuntu focal-infra-updates InRelease
Fetched 336 kB in 3s (104 kB/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
All packages are up to date.
I have a few extra files in the /etc/apt/sources.list.d folder, notably for the esm repository.
Now, if I run do-release-upgrade, I will see the following:
Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done
Hit http://ftp.ubuntu.com/ubuntu focal InRelease
Hit http://ftp.ubuntu.com/ubuntu focal-updates InRelease
Get:1 http://ftp.ubuntu.com/ubuntu focal-backports InRelease [108 kB]
Hit http://ppa.launchpad.net/ondrej/apache2/ubuntu focal InRelease
Get:2 http://security.ubuntu.com/ubuntu focal-security InRelease [114 kB]
Hit https://esm.ubuntu.com/apps/ubuntu focal-apps-security InRelease
Hit https://esm.ubuntu.com/apps/ubuntu focal-apps-updates InRelease
Hit https://esm.ubuntu.com/infra/ubuntu focal-infra-security InRelease
Hit https://esm.ubuntu.com/infra/ubuntu focal-infra-updates InRelease
Fetched 222 kB in 0s (0 B/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
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]
And if I press [ENTER]:
Get:1 http://security.ubuntu.com/ubuntu jammy-security InRelease [110 kB]
Get:2 https://esm.ubuntu.com/apps/ubuntu jammy-apps-security InRelease [7,553 B]
Get:3 https://esm.ubuntu.com/apps/ubuntu jammy-apps-updates InRelease [7,459 B]
Get:4 https://esm.ubuntu.com/infra/ubuntu jammy-infra-security InRelease [7,453 B]
Get:5 https://esm.ubuntu.com/infra/ubuntu jammy-infra-updates InRelease [7,452 B]
Get:6 http://security.ubuntu.com/ubuntu jammy-security/main i386 Packages [277 kB]
Get:7 http://security.ubuntu.com/ubuntu jammy-security/main amd64 Packages [631 kB]
Get:8 https://esm.ubuntu.com/apps/ubuntu jammy-apps-security/main amd64 Packages [41.5 kB]
Get:9 http://security.ubuntu.com/ubuntu jammy-security/main Translation-en [148 kB]
Get:10 http://security.ubuntu.com/ubuntu jammy-security/main amd64 c-n-f Metadata [11.0 kB]
Get:11 http://security.ubuntu.com/ubuntu jammy-security/restricted i386 Packages [29.7 kB]
Get:12 http://security.ubuntu.com/ubuntu jammy-security/restricted amd64 Packages [651 kB]
Get:13 http://security.ubuntu.com/ubuntu jammy-security/restricted Translation-en [104 kB]
Get:14 http://security.ubuntu.com/ubuntu jammy-security/restricted amd64 c-n-f Metadata [532 B]
Get:15 http://security.ubuntu.com/ubuntu jammy-security/universe amd64 Packages [756 kB]
Get:16 https://esm.ubuntu.com/apps/ubuntu jammy-apps-security/main i386 Packages [32.7 kB]
Get:17 http://security.ubuntu.com/ubuntu jammy-security/universe i386 Packages [544 kB]
Get:18 http://security.ubuntu.com/ubuntu jammy-security/universe Translation-en [136 kB]
Get:19 https://esm.ubuntu.com/apps/ubuntu jammy-apps-updates/main amd64 Packages [479 B]
Get:20 http://security.ubuntu.com/ubuntu jammy-security/universe amd64 c-n-f Metadata [15.9 kB]
Get:21 http://security.ubuntu.com/ubuntu jammy-security/multiverse amd64 Packages [36.5 kB]
Get:22 http://security.ubuntu.com/ubuntu jammy-security/multiverse i386 Packages [1,032 B]
Get:23 http://security.ubuntu.com/ubuntu jammy-security/multiverse Translation-en [7,060 B]
Get:24 http://security.ubuntu.com/ubuntu jammy-security/multiverse amd64 c-n-f Metadata [260 B]
Get:25 https://esm.ubuntu.com/infra/ubuntu jammy-infra-security/main amd64 Packages [479 B]
Get:26 https://esm.ubuntu.com/infra/ubuntu jammy-infra-updates/main amd64 Packages [479 B]
Fetched 3,567 kB 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.
So we can clearly see that do-release-upgrade just decided to nuke the list of all of the ftp.ubuntu.com/ubuntu main sources in its second step, while keeping the security.ubuntu.com ones from the same file, which of course leads to the upgrade failure, but I have no understanding of why it's removing them, nor how to prevent it from removing them.
I guess the long story short question here might be, as it says it's removing third party sources, maybe it thinks the main focal repository is third party in this case, so how is it determining that it's a third party source, maybe, if that's the cause, and how to prevent it from thinking it's a third party source?
