It seems that I have the same issue here: Host: windows 7 x64 VirtualBox 5.2.8 Guest: lubuntu 16.04 amd64 virtualbox-guest-dkms-hwe installed from standard repos (and associated utils-hwe and x11-hwe).
After upgrading guest additions(the above three packages only) from 5.0.40 to 5.1.34 and guest reboot Firefox and some other apps do not start in the guest. When an affected app is run via a mouse click nothing happens except the mouse pointer changes to hour glass for about ten seconds. When the mouse pointer is in that state I do not see the launched app in the output of `ps` utility. When run from bash console the affected apps produce no output, just exit. Apps that do not start: firefox, synaptic, galculator Apps that are ok: pcmanfm, leafpad, all qt-based programs ** Attachment added: "apt and dkms log" https://bugs.launchpad.net/ubuntu/+source/virtualbox/+bug/1758946/+attachment/5092433/+files/vb.dkms.log -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1758946 Title: virtualbox-guest-utils update caused Synaptic to stop working To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/virtualbox/+bug/1758946/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
