I can't reproduce the problem in a clean xenial VM. When you say you can locate libffmpeg.so, where is it installed?
Does the following command improve things? sudo apt install --reinstall chromium-codecs-ffmpeg-extra -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1718885 Title: chromium doesn't start in guest session (xubuntu 16.04) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/chromium-browser/+bug/1718885/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs