Ubuntu packages now on Launchpad

Starting with release 6.2.1711 Ubuntu packages are now hosted on Launchpad.

Stable: NGSolve stable : “NGSolve” team
Nightly: NGSolve nightly builds : “NGSolve” team

Please remove the old repository before updating, instructions to do so are for instance here:

To activate the new repository follow the instructions on the Downloads page