I sometimes have problems if I close or minimize windows in Ubuntu 15.04.
If I want to close the window or minimize it, the system gets stuck and I can no longer click on anything. Only with the Super key or Ctrl+Super+↓ I can minimize the window properly.
What can I do to fix this problem?
sudo apt-get update
thensudo apt-get upgrade
xprop -id $(xprop -root -notype | awk '$1=="_NET_SUPPORTING_WM_CHECK:"{print $5}') -notype -f _NET_WM_NAME 8t
and your sessionecho $XDG_CURRENT_DESKTOP