I have consistently gotten this message with Ubuntu and other Ubuntu based distro's....
Generally the way to remove that PPA is to go to Software Sources and rm the conflicting ppa's. However I wasn't able to do that with Voyager Linux (built on Ubuntu and Xubuntu)
Instead I had to use the command line to rm that annoying cairo-dock-team/ppa/ubuntu xenial main.
Here's how I removed it:
For some reason I couldn't rm the cairo dock as root in the Software Sources gui but the above cmd did the trick.:)
Code:
Some index files failed to download. They have been ignored or old ones used instead
Instead I had to use the command line to rm that annoying cairo-dock-team/ppa/ubuntu xenial main.
Code:
sudo rm -i /etc/apt/sources.list.d/PPA-Name.list
Code:
sudo rm -i /etc/apt/sources.list.d/cairo-dock-team-ubuntu-ppa-xenial.list
