ok, in hopes that someone can use the information I have gathered to come up with a solution. I tried running Kobo from /usr/local/Kobo , it complained about the lack of libQtSolutions_IOCompressor-2.3.so.1 , so I symlinked Compressor into /lib . Tried running again, this time complaining about lack of libQtSolutions_SingleApplication-2.6.so.1 , so I symlinked SingleApp into /lib . Tried running again, complaining about lack of libnickel.so.1 , symlink nickel into /lib .... Tried running again .... now we get the incompatible QT library complaint.
An other thing I noticed is that deb/testing is using QT 4.6.3 and kobo desktop comes with QT 4.6.2
BUT, Kobo desktop runs fine when I run as su (root) , so I have to wonder if my regular user account is running a program which uses a QT library which is incompatible with libnickel . Somehow this does not effect other users (root) when running the Kobo desktop.
Open for suggestions