1. In case the freeze was a crash please follow these instructions:
https://wiki.ubuntu.com/Bugs/Responses#Missing_a_crash_report_or_having_a_.crash_attachment
2. Your system log has one unusual thing in it: bluetoothd is running
out of files. If that problem was system-wide then it might
theoretically hang Xorg too. Please run this command to find out which
process ID is using the most file descriptors:
sudo grep FDSize /proc/*/status
and then find out the name of the process(es) with the most file
descriptors.
3. Try stopping the program 'popcorntime' in case that's using too many
resources per above.
** Package changed: xorg (Ubuntu) => xorg-server (Ubuntu)
** Changed in: xorg-server (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1879007
Title:
Xorg freeze
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