Hello, you must write sudo, for that it works. Remember (copy it):
sudo gtk-update-icon-cache /usr/share/icons/elementary-xfce-darkest
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https://bugs.launchpad.net/bugs/1872313
Title:
The theme is missing cache files-I think through XFCE Startup or in the
package's postinstall script you need to execute the command as said in
the notification error triangle message thing:
"Warning: this icon theme has no cache file. You can create this by
running gtk-update-icon-cache /usr/shar
** Changed in: elementary-xfce (Ubuntu)
Status: New => Confirmed
** Changed in: elementary-xfce (Ubuntu)
Importance: Undecided => Low
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https://bugs.launchpad.net/bugs/1872313
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