Thanks, renaming both entries to "stable main" has solved the problem. I'm not sure what's the proper way of editing those lines. At first I edited them in the GUI (software-properties-gtk):
After that, when I looked at the files in:
one of the ".list.save" files was still showing trusty instead of stable, so I changed it to stable, just in case.
After that, when I looked at the files in:
Code:
/etc/apt/sources.list.d
one of the ".list.save" files was still showing trusty instead of stable, so I changed it to stable, just in case.
LL 2.4, Xubuntu 14.04.2, Debian 8, Manjaro