Yes I had. Now I tried again and got the following w/e:

W: GPG error: http://moff.mozilla chinook Relase: The following signatures couldn't ve verified because the public key is not available: NO_PUBKEY 667387FBFFF445C24
W: Duplicate sources.list. entry http://repository.meamo.org fremantle/free Packages (/var/lib/apt/lists/repository.maemo.org_extras_dists_freantel_free_bi nary-armel_Packages)
W: Duplicate sources.list entry http://repository.maemo.org fremantle/non-free Packages (/var/lib/apt/lists/repository.maemo.org_extras_dists_fremantle_non-free_binary-armel_Packages)
W: You may want to run apt-get update to correct these problems.

After I ran it again as suggested, it closes with:
W: GPG error: http://moff.mozilla chinook Relase: The following signatures couldn't ve verified because the public key is not available: NO_PUBKEY 667387FBFFF445C24
W: You may want to run apt-get update to correct these problems.

Running it again I got again got the first error messages:
W: GPG error: http://moff.mozilla chinook Relase: The following signatures couldn't ve verified because the public key is not available: NO_PUBKEY 667387FBFFF445C24
W: Duplicate sources.list. entry http://repository.meamo.org fremantle/free Packages (/var/lib/apt/lists/repository.maemo.org_extras_dists_freantel_free_bi nary-armel_Packages)
W: Duplicate sources.list entry http://repository.maemo.org fremantle/non-free Packages (/var/lib/apt/lists/repository.maemo.org_extras_dists_fremantle_non-free_binary-armel_Packages)
W: You may want to run apt-get update to correct these problems.

Looks like a vicious circle to me. I also tried to use the app manager to update maemo5, but again there was no space on destination drive, although there is still far over one GB left...