Exactly, no addresses on all three seeds.
Doesn't look good, uh?
I'm cursing myself for not writing down where the seeds belong to.
And some of the words of two of the seeds aren't proper English words at all.
Seems like my own stupidity is going to cost me quite some money ...
You mean this command...?
wallet.change_gap_limit(200)
Ah, sorry, my mistake.
Alright, I'm going to reinstall electrum now and report back afterwards.
Thank you all!
/Edit:
Reinstalling didn't change anything about the pbkdf2 error
//Edit:
Electrum does synchronize and I do see the addresses and my balance when opening the encrypted wallet file which contains my bitcoins.
This means just none of my seeds is correct, doesn't it?///Edit:
Can't start electrum under Ubuntu at all now, so I'm just going to use Windows 7 from now on.