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I was trying to get rid of update-notifier because it was being a pain, and I did sudo apt remove update-notifier. I didn't really look at the details but I should have; it also removed the ubuntu-desktop package with it. It didn't crash my current instance or whatever.

So I tried installing it back, with sudo apt install ubuntu-desktop, but this causes a dependecy hell:

When I try to install ubuntu-desktop:

 ubuntu-desktop : Depends: ubuntu-release-upgrader-gtk but it is not going to be installed
                  Depends: update-manager but it is not going to be installed

When I do sudo apt install ubuntu-release-upgrader-gtk update-manager:

 ubuntu-release-upgrader-gtk : Depends: ubuntu-release-upgrader-core (= 1:18.04.17) but 1:18.04.34 is to be installed
                               Depends: python3-distupgrade (= 1:18.04.17) but 1:18.04.34 is to be installed
 update-manager : Depends: update-manager-core (= 1:18.04.11) but 1:18.04.11.10 is to be installed

These above packages are already installed on my system. Yes, I have done sudo apt update.

What do I do to get it back?

frick
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    I would check your sources and your chosen mirror, https://packages.ubuntu.com/search?suite=all&searchon=names&keywords=ubuntu-release-upgrader-core shows your ubuntu-release-upgrade-gtk is out-of-date like you haven't sudo apt update yet (which you say you have; thus the mirror check). Do you get any errors in your sudo apt update, are all expected lines there?, and from what mirror? Check on https://launchpad.net/ubuntu/+archivemirrors to see if it's up-to-date is my first suggestion. – guiverc Dec 12 '19 at 10:17
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    @guiverc I just added a new "Up to date" repo to sources.list, and it still doesn't work. Still shows this incompatiblity hell. – frick Dec 12 '19 at 16:30
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    Oh yes! Turns out the issue is with the bionic channel having an outdated version. Adding bionic-updates to my sources.list fixed it. – frick Dec 12 '19 at 16:48

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