mironsadziak - 2009-11-07

That is actually a problem of combination IzPack+Ubuntu. (IzPack is used as installer for SQuirreL).
IzPack creates file .local/share/applications/SQuirreL\ SQL\ Client*********.desktop which should contain SQuirreL's directory on property Path, but without apostrophes. For some reason IzPack adds apostrophes when the install directory contains spaces, which is probably wrong behavior.
Unfortunately in Ubuntu you can not access that Path setting with GUI (as far as I know. prove me if im wrong). You can only change it by editing that file.
Maybe upgrading IzPack to the newest version will solve the issue.