"Could not find '' executable." after apt-get install/remove

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http://askubuntu.com – I get this message (Could not find '' executable.) in terminal after using sudo apt-get since I installed and removed Krusader. I'm using Ubuntu 12.10 with Unity. $ sudo apt-get remove gstm Reading package lists... Done Building dependency tree Reading state information... Done The following packages will be REMOVED: gstm 0 upgraded, 0 newly installed, 1 to remove and 17 not upgraded. After this operation, 265 kB disk space will be freed. Do you want to continue [Y/n]? y (Reading database ... 168039 files and directories currently installed.) Removing gstm ... Processing triggers for man-db . (HowTos)