Hi. Thanks for your help and sorry for the delay in answering.
I found the problem while gathering info for you: # apt-cache policy Package files: 100 /var/lib/dpkg/status release a=now 1 http://deb.debian.org/debian experimental/main amd64 Packages release o=Debian,a=experimental,n=experimental,l=Debian,c=main,b=amd64 origin deb.debian.org 500 http://deb.debian.org/debian sid/contrib amd64 Packages release o=Debian,a=unstable,n=sid,l=Debian,c=contrib,b=amd64 origin deb.debian.org 500 http://deb.debian.org/debian sid/non-free amd64 Packages release o=Debian,a=unstable,n=sid,l=Debian,c=non-free,b=amd64 origin deb.debian.org 500 http://deb.debian.org/debian sid/main amd64 Packages release o=Debian,a=unstable,n=sid,l=Debian,c=main,b=amd64 origin deb.debian.org Pinned packages: libmypaint-common -> 1.3.0-2 with priority -30000 This file was in /etc/apt/preferences.d/apt-listbugs: Explanation: Pinned by apt-listbugs at 2018-05-03 08:43:14 +0200 Explanation: #894757: libmypaint-common: file conflict with mypaint-data Package: libmypaint-common Pin: version * Pin-Priority: -30000 After removing the file, I could install gimp without issues. Best regards! On Mon, Jun 18, 2018 at 9:41 PM James Cowgill <jcowg...@debian.org> wrote: > Hi, > > Sorry I accidentally sent the last email by mistake before it was finished. > > On 18/06/18 14:35, José Couto wrote: > > Sorry, I forgot to cc bugs.debian.org <http://bugs.debian.org>. > > > > Hi, James. Thank you for your help. > [...] > > I can't install libmypaint-common by hand either: > > > > ### > > # apt-get -o Debug::pkgProblemResolver=yes install libmypaint-commo > > n > > > > Reading package lists... Done > > Building dependency tree > > Reading state information... Done > > Package libmypaint-common is not available, but is referred to by > > another packag > > e. > > This may mean that the package is missing, has been obsoleted, or > > is only available from another source > > > > E: Package 'libmypaint-common' has no installation candidate > > ### > > As I said I don't know what's wrong here. That package should exist and > does exist in the main package lists and on my machine. > > Maybe try running "apt update" again? > What's in your /etc/apt/sources.list? > > James > >