Hi dear developers,
On Ubuntu 14.04, there is no installation candidate for 'rubygems' or 'rubygems-doc'. But there exist those packages for installation on Trisquel 7 directly and it causes a conflict between 'ruby-full' and 'rubygems'.
Searching rubygems on Ubuntu 14.04 repo:
http://packages.ubuntu.com/search?keywords=rubygems&searchon=names&suite=trusty§ion=all
Searching rubygems on Trisquel repo:
http://packages.trisquel.info/search?keywords=rubygems&searchon=names&suite=belenos§ion=all
I ran into this problem too, when trying to use Red Hat's OpenShift web hosting. I assumed that I was doing something wrong when I got the error message -- thanks for pointing me to this bug report akfoss.
No idea about this issue?