I think i broke my repositories somehow (looks like it happened after install postgress).
For example when i try to install python3-dialog (and many other standard packages) that present in focal universe repository I faced problem:
sudo apt-get install -y python3-dialog
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package python3-dialog is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package 'python3-dialog' has no installation candidate
The strange thing that when i try to apt update i see conflict:
sudo apt update
Get:1 file:/var/opt/amdgpu-pro-local ./ InRelease
Ign:1 file:/var/opt/amdgpu-pro-local ./ InRelease
Get:2 file:/var/opt/amdgpu-pro-local ./ Release [816 B]
Get:2 file:/var/opt/amdgpu-pro-local ./ Release [816 B]
Get:3 file:/var/opt/amdgpu-pro-local ./ Release.gpg
Ign:3 file:/var/opt/amdgpu-pro-local ./ Release.gpg
Get:4 http://ru.archive.ubuntu.com/ubuntu focal InRelease [265 kB]
Ign:5 http://dl.google.com/linux/chrome-remote-desktop/deb stable InRelease
Hit:6 http://ppa.launchpad.net/team-xbmc/ppa/ubuntu focal InRelease
Hit:7 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:8 http://ru.archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:9 http://dl.google.com/linux/chrome-remote-desktop/deb stable Release
Hit:10 http://ru.archive.ubuntu.com/ubuntu focal-backports InRelease
Hit:11 http://security.ubuntu.com/ubuntu focal-security InRelease
Hit:12 https://packages.microsoft.com/ubuntu/20.10/prod groovy InRelease
Hit:13 https://packages.microsoft.com/repos/ms-teams stable InRelease
Hit:15 https://repo.protonvpn.com/debian stable InRelease
Hit:16 https://download.mono-project.com/repo/ubuntu vs-focal InRelease
Get:17 https://pkgs.tailscale.com/stable/ubuntu focal InRelease
Hit:18 https://repo.steampowered.com/steam stable InRelease
Hit:19 https://download.docker.com/linux/ubuntu focal InRelease
Fetched 270 kB in 4s (65,1 kB/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
22 packages can be upgraded. Run 'apt list --upgradable' to see them.
W: Conflicting distribution: http://ru.archive.ubuntu.com/ubuntu focal InRelease (expected focal but got focal-pgdg)
I didn't understand where did the focal-pgdg came from.
And another thing that worries me is that a lot of standard packages in apt looks so:
sudo apt list --installed | grep pgdg
.....
gparted-common/focal-pgdg,now 1.0.0-0.1build1 all [installed,automatic]
gparted/focal-pgdg,now 1.0.0-0.1build1 amd64 [installed]
grep/focal-pgdg,now 3.4-1 amd64 [installed]
grilo-plugins-0.3-base/focal-pgdg,now 0.3.11-1ubuntu1 amd64 [installed,automatic]
groff-base/focal-pgdg,now 1.22.4-4build1 amd64 [installed,automatic]
grub-gfxpayload-lists/focal-pgdg,now 0.7 amd64 [installed]
.....
printer-driver-splix/focal-pgdg,now 2.0.0+svn315-7fakesync1build1 amd64 [installed,automatic]
psmisc/focal-pgdg,now 23.3-1 amd64 [installed,automatic]
publicsuffix/focal-pgdg,now 20200303.0012-1 all [installed,automatic]
python3-alembic/focal-pgdg,now 1.1.0-1ubuntu1 all [installed,automatic]
.....
It's not an all packages with focal-pgdg in name, there is 1153 entries.
