Haven't experienced this for a long time, so marking this as fix
released.
** Changed in: unity8 (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1452760
a guess here is that something might have crashed, and is hogging resources
writing the crash file.
can you check /var/crash/ and if you have something therethat might be
related.
run apport-cli on the file to process, upload and report to errors.ubuntu.com
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