I was trying to compile a hello world c file. I tried to apt-get install build_essentials but it said it couldn't because of g++ perhaps it was g++6. I then told it to install that and it complained about something else. Eventually it said it would have to downgrade something for me to install and I said go ahead. I think it might have been libc. I went through with it but then after I reboot the computer the kde login screen is unfamiliar and doesn't work. It is blue with I can still switch desktops to a console and log in.
I believe the ubuntu version is Ubuntu 20.04.3 LTS. (or at least was before the command lol)
What is the recommended set of actions to get the system back up and running. It is ok of gcc doesn't work. I have other computers. Is there a simple set of apt-get commands which will remove the stupid downgrade I put in and put things back to where they were? I can confirm this and other things.
Here is what the login screen should look like:

And this is what the login screen does look like:

I found the apt-get log file. It looks like the first thing which got uninstalled was kubuntu-desktop so installing that again may be the ticket.
Log started: 2021-12-25 09:00:35
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update-alternatives: using /etc/newt/palette.ubuntu to provide /etc/newt/palette (newt-palette) in auto mode
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Log ended: 2021-12-25 09:00:37
Log started: 2021-12-25 09:00:50
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Log ended: 2021-12-25 09:00:50
Log started: 2021-12-25 09:03:30
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update-alternatives: using /usr/bin/fakeroot-sysv to provide /usr/bin/fakeroot (fakeroot) in auto mode
Setting up libasan5:amd64 (9.3.0-17ubuntu1~20.04) ...
Setting up make (4.2.1-1.2) ...
Setting up libpulse-mainloop-glib0:amd64 (1:13.99.1-1ubuntu3.13) ...
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Setting up libglapi-mesa:amd64 (21.0.3-0ubuntu0.3~20.04.5) ...
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Setting up pulseaudio (1:13.99.1-1ubuntu3.13) ...
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Setting up libc6-dev:amd64 (2.31-0ubuntu9.2) ...
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update-alternatives: using /usr/bin/g++ to provide /usr/bin/c++ (c++) in auto mode
Setting up build-essential (12.8ubuntu1.1) ...
Processing triggers for systemd (245.4-4ubuntu3.13) ...
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Log ended: 2021-12-25 09:03:56