Well, just uninstalling it from Application Manager and then installing it again should do the trick.
/home/user # apt-get install canola2=2.0.0~beta9-maemo3 Reading package lists... Done Building dependency tree Reading state information... Done The following packages were automatically installed and are no longer required: gpe-contacts gpe-todo Use 'apt-get autoremove' to remove them. The following NEW packages will be installed: canola2 0 upgraded, 1 newly installed, 0 to remove and 58 not upgraded. Need to get 0B/1539kB of archives. After unpacking 2474kB of additional disk space will be used. WARNING: The following packages cannot be authenticated! canola2 Install these packages without verification [y/N]? y Selecting previously deselected package canola2. (Reading database ... 29431 files and directories currently installed.) Unpacking canola2 (from .../canola2_2.0.0~beta9-maemo3_all.deb) ... Setting up canola2 (2.0.0~beta9-maemo3) ... Error: couldn't read plugins information from canola-core/plugins.info: 'canola-core/plugins.info' /home/user #