Trying to re-install gimp

[jgw]

I had some problems trying to clean up my desktop. Below is what happened when I tried to update.

greg@gregdown:~$ sudo apt update
[sudo] password for greg: 
Ign:1 cdrom://Ubuntu 20.04.1 LTS _Focal Fossa_ - Release amd64 (20200731) focal InRelease
Err:2 cdrom://Ubuntu 20.04.1 LTS _Focal Fossa_ - Release amd64 (20200731) focal Release
  Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
Hit:3 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:4 http://us.archive.ubuntu.com/ubuntu focal InRelease                      
Get:5 http://security.ubuntu.com/ubuntu focal-security InRelease [109 kB]      
Get:6 http://us.archive.ubuntu.com/ubuntu focal-updates InRelease [114 kB]     
Hit:7 http://ppa.launchpad.net/jcfp/nobetas/ubuntu focal InRelease             
Hit:8 http://archive.canonical.com/ubuntu focal InRelease                      
Get:9 http://us.archive.ubuntu.com/ubuntu focal-backports InRelease [101 kB]   
Hit:10 http://ppa.launchpad.net/jcfp/sab-addons/ubuntu focal InRelease
Hit:11 http://ppa.launchpad.net/mkusb/ppa/ubuntu focal InRelease
Hit:12 http://ppa.launchpad.net/otto-kesselgulasch/gimp/ubuntu focal InRelease
Hit:13 http://ppa.launchpad.net/stebbins/handbrake-releases/ubuntu focal InRelease
Hit:14 http://ppa.launchpad.net/webupd8team/y-ppa-manager/ubuntu focal InRelease
Reading package lists... Done
E: The repository 'cdrom://Ubuntu 20.04.1 LTS _Focal Fossa_ - Release amd64 (20200731) focal Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

greg@gregdown:~$ sudo apt upgrade
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
greg@gregdown:~$

I then went to synaptic and tried to reinstall gimp (it failed) then I told it to fix broken packages and got:
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
E: Unable to correct dependencies

then I asked synaptic for a held packages and got:

icad-templates                   5.1.5-1                     project templates for kicad
libsane				1.0.29-0ubuntu5       API library for scanners
matchbox                          1:6                           base X environment for resource-limited system
r-cran-polycub                   0.7.1-1                     GNU R Cubature over Polygonal Domains
zietgeist                            1.0.2.3ubuntu2         event logging framwork

After that I stopped. I did try some other stuff but I am stuck with mysterious things such as held packages. Until I fix this I can do nothing. I was thinking of downloading and re-installing gimp but figure that would just complicate stuff. I am also considering downloading ubuntu 20.10 and installing that just to see if that fixes anything but decided to write this instead. Any help would be appreciated.

Thoughts?

[CelticWarrior]

Nothing happened with the apt update / apt upgrade process except the error about the 'cdrom' also explained here.
Why where you trying to reinstall Gimp? What's the result of

sudo apt install --reinstall gimp

[rsteinmetz70112]

I notice you appear to have have

Ign:1 cdrom://Ubuntu 20.04.1 LTS _Focal Fossa_ - Release amd64 (20200731) focal InRelease
Err:2 cdrom://Ubuntu 20.04.1 LTS _Focal Fossa_ - Release amd64 (20200731) focal Release

Do you have that in your sources? If you don't need it you might want to remove it.

Have you tried to explicitly update the held packages of reinstall them?

apt install icad-templates --reinstall

[UltimateCat]

APT is looking for the cdrom. In other words it's looking for the cd that you install Ubuntu with.

You should edit your sources list and uncomment the cdrom argument.