The upgrade failed because you don't have any of the established meta
packages installed.
2015-12-22 04:38:02,704 DEBUG need_server_mode(): can not find a desktop meta
package or key deps, running in server mode
...
2015-12-22 04:39:42,650 DEBUG need_server_mode(): can not find a desktop meta
package or key deps, running in server mode
Based off the packages you have installed you probably want to install
the ubuntu-gnome-desktop package and try the upgrade again.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
** Summary changed:
- won't upgrade
+ won't upgrade because Zorin OS doesn't install a desktop meta package
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https://bugs.launchpad.net/bugs/1528492
Title:
won't upgrade because Zorin OS doesn't install a desktop meta package
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