Got it!
I had set only belenos main in `/etc/apt/sources.list` But I think the
installed OS have main + security-updated packages.
Now I've added belenos-security updates as well as belenos-main in
`/etc/apt/sources.list`:
$ cat /etc/apt/sources.list
# deb cdrom:[Trisquel 7.0 _belenos_ - Release i686 (20141102)]/ toutatis main
# Trisquel repositories for supported software and updates
deb http://mirror.fsf.org/trisquel/ belenos main
deb-src http://mirror.fsf.org/trisquel/ belenos main
deb http://mirror.fsf.org/trisquel belenos-security main
#deb-src http://mirror.fsf.org/trisquel belenos-security main
And apt installing working fine without unmet dependencies error (again note
that this has nothing to do with belenos-update)
[SOLVED]
