Debian Screws Apt, What Am I Doing Wrong? Options

[arzgi]

I tried Zdevil's debian-rootfs (eabi) first. Installed fine to my SL-C3100,
but soon after installing a few debs from official mirror, dependency
problems made apt so broken that I could not install anything more.
First time ever I used sid, I've been running stable Debians on my
desktop pc's for years. I thought, it was just unstable sid.

So tried titchy, then oabi kernels, but they all led to the same
result. Errors that apt gives all usually something like "chown:changing
ownership of file n\465\235 [or any arbitary x\nnn\nnn]: No such file
or directory". Funny thing is, when I execute post-install script of
problematic .deb line by line, works then like it should.

Thought microdrive was dying, changed to cf-card. Did not help.
Next thought, Z's "hd-driver-chip" is corrupted, Bought another
used SL-C3100, but I'm still where I started.

I really cant get it, what causes this? Any hint appreciated.