It happens to me to. Usually, when I click (with mouse) at some panel
element (calendar, configuration icon etc.).
I've a Dell Notebook with NVidia on it.
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Public bug reported:
not upgrade
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.8
ProcVersionSignature: Ubuntu 3.13.0-61.100-generic 3.13.11-ckt22
Uname: Linux 3.13.0-61-generic i686
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: i386
CrashDB: ubuntu
** Attachment added: 200908050340_111.jpg
http://launchpadlibrarian.net/29939126/200908050340_111.jpg
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jaunty and intrepid shutdown/restart hang on acpid: exiting
https://bugs.launchpad.net/bugs/302452
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Bugs, which is
I replace the vino with x11vnc before that there is no real fix
I use gnome but with krfb and KRDC there is the same problem, screen not
refresh in client machine
My temporary work around and not a fix
# sudo apt-get remove vino
# killall vino-server
# sudo apt-get install x11vnc
#