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After running a package upgrade with little RAM available, my Paper icon theme install is broken. apt-get purgeing and reinstalling the package, with reboots after every step, hasn't helped. When I select the Paper icon theme in Unity Tweak Tool, the icons revert back to the default (hideous) Gnome ones.

Just before the icons broke, the following error came up in the graphical update manager:

Unpacking paper-icon-theme (version) over (version) ...
gtk-update-icon-cache-3.0: **
Gtk:ERROR/build/gtk+3.0-3sSotQ/gtk+3.0-3.10.8/./gtk/updateiconcache.c:1117:write_bucket: assertion failed: (*offset == ftell (cache))
Aborted (core dumped)
WARNING: icon cache generation failed for /usr/share/icons/Paper

Unfortunately, when I pressed 'Report problem', there was apparently not enough free memory to analyse the problem and send a bug report.

How can I fix the theme?

  • So, what would be the question? Either: How to send a bug report for the broken theme, How to fix the broken theme, How to install Paper icon theme with little RAM; And how little is the RAM? The list goes on without specifying what is the question... – clearkimura Dec 3 '15 at 3:58
  • @clearkimura How to fix the broken theme was what I was intending. – Josh Dec 3 '15 at 7:09
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I solved the problem by deleting icon-theme.cache in /usr/share/icons/Paper/. To recreate the cache file (which apparently reduces disk usage, according to the man page), run

sudo gtk-update-icon-cache /usr/share/icons/Paper/

and reselect the icon theme in Unity Tweak Tool. A reboot shouldn't be necessary.

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