*** This bug is a duplicate of bug 1712089 *** https://bugs.launchpad.net/bugs/1712089
This also affects me. I'm using Ubuntu 17.10 with default GUI setup. It looks like XWayland is running. I entered the xhost command as suggested by ichro furuya above and that resolved the issue. Personally the xhost shouldn't be required. The installation should arrange the security so I don't have to do this. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1721544 Title: I installed "Synaptic Package Manager", but I can not start it. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/synaptic/+bug/1721544/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs