Reinstalled Ubuntu 8.04 once again, and same thing happened. The package "update-manager" and "rhythmbox" couldn't get updated because during their setting up "scrollkeeper-update" crashed with the aforementioned error. So, to be more precise, the number of crashes is 2 during the update -- the first update after clean install of Ubuntu 8.04.
Reinstalled Ubuntu 8.04 once again, and same thing happened. The package "update-manager" and "rhythmbox" couldn't get updated because during their setting up "scrollkeeper- update" crashed with the aforementioned error. So, to be more precise, the number of crashes is 2 during the update -- the first update after clean install of Ubuntu 8.04.