I highly doubt that it has something to do with VT-x since both host and guest are x64, and VirtualBox does not support x64 guests without VT-x. Anyway, my CPU is i7-4510U.
There is an update for VirtualBox extension pack, I have not installed it yet. I tried one more time: -> Clean install Xubuntu 16.04. -> Full update. No automatic guest display resolution based on window size (but it does scale once during boot), no clipboard sharing. xfce4-display-settings segfaults if the current resolution is not one that is listed (otherwise works fine), xrandr -s works fine. -> Snapshot. -> Instal virtualbox-guest-x11-hwe -> Reboot This installs virtualbox-guest-dkms-hwe as a dependency. This is how I installed it in the first place. Guest display resolution scaling works fine, as does clipboard sharing. Problems as described above. I attached an strace of users-admin. -> Revert to snapshot -> Install virtualbox-guest-source-hwe No effect - it is indeed not build -> Install virtualbox-guest-x11-hwe and reboot (virtualbox-guest-dkms-hwe is not installed this time) All kinds of errors in popups that VBoxClient can't access the kernel (ERR_ACCESS_DENIED) Somehow I got it working last time, and I swear I saw the kernel module being build from apt. I went back to the working machine and found indeed that virtualbox-guest-utils-hwe and virtualbox-guest-source-hwe are installed but virtualbox-guest-dkms-hwe not, but auto guest scaling and clipboard sharing does not work, so you're right about the source package doing nothing (except that it allows virtualbox-guest-x11-hwe to be installed without the dkms package). I am unable to download the old binaries from the link you provided. The link "Binaries build by this source" just link to the latest. However, I am 100% sure it worked with the previous one since I heavily use zenity in my application so I was very surprised that my application didn't do anything any more after an update. ** Attachment added: "users-admin" https://bugs.launchpad.net/ubuntu/+source/virtualbox-hwe/+bug/1760063/+attachment/5126396/+files/users-admin -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1760063 Title: Many tools don't start after upgrade of virtualbox-hwe To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/virtualbox-hwe/+bug/1760063/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
