New answers tagged appearance
Just to followup: I never managed to fix the problem concerning the wallpaper dialog but I found a workaround to change it from the command line with this little script: #! /bin/bash path=$(cd $(dirname $1); pwd)/$(basename $1) gsettings set org.gnome.desktop.background picture-uri file://$path
I had the same issue once. I disconnected the cable from the system, restarted the phone, and it worked.
Try Unity Tweaks, available in the Ubuntu Apps Store. You might not be able to change some things that you want, but there will another thing you can change to make it more like you want (that's the cool thing about linux).
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