Thanks! Soon after installing Ubuntu, I had disabled the updates (by
setting it to use only security updates, see attachment picture).
I did not know that changing that would change my system sources.
I changed it back to `All updates` and now I was able to install
`libglib2.0-dev`
```
$ sudo ap
I do not have installed libglib2.0-dev as you can see
```
$ dpkg -l | grep glib2.0
ii libglib2.0-0:amd642.64.3-1~ubuntu20.04.1
amd64GLib library of C routines
ii libglib2.0-bin2.64.3-1~ubuntu20.04.1
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