After I installed 18.10 (when it was beta) and started to install all software I got this problem with MyPaint. Today this problem still persists. Universe repository is enabled. I was able to install it from flatpak thought.
sudo apt -f install doesn't see any problems.
When I'm trying to install MyPaint:
$ sudo apt install mypaint Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: mypaint : Depends: mypaint-data (>= 1.2.0-4.1) but it is not going to be installed E: Unable to correct problems, you have held broken packages. $ apt-cache policy mypaint mypaint-data mypaint: Installed: (none) Candidate: 1.2.0-4.1 Version table: 1.2.0-4.1 500 500 http://archive.ubuntu.com/ubuntu cosmic/universe amd64 Packages mypaint-data: Installed: (none) Candidate: 1.2.0-4.1 Version table: 1.2.0-4.1 500 500 http://archive.ubuntu.com/ubuntu cosmic/universe amd64 Packages 500 http://archive.ubuntu.com/ubuntu cosmic/universe i386 Packages