I found Debian Sarge's installing a little hard, because I noticed some bugs. I would want to post them to Debian's bug tracking system, but I don't know the installing program's name. I guess that it's called "debian-installer" but I'm not sure. I encountered also less critical bugs but I got over them. Then the big problem itself, if it wouldn't be a bug:
The partitioning and base-install succeeded great, but when the system booted, I got problems. I forgot to say that I downloaded only the first Debian image with Jigdo about 2 weeks ago and no errors showed up. After booting I of course took off the cd. I put back the cd, when Debian requested it. When Apt configuration window appeared, I chose cdrom from the list and after that I get error: "Cannot access security updates". There was only <Ok> button and I pressed enter. After that, it didn't continue installing and I wasn't able to give any commands. I started to resolve the problem and first:
In /dev directory were cdrom, cdrom0 and hdb files (I'm not sure about hdb, but it was a block device however) linked to each other. cdrom was linked to cdrom0 and cdrom0 to hdb (or other block device). Second:
I didn't found any other "oddness" in the system

(I'm a bit novice). Probably Debian Sarge doesn't support my cdrom/dvd device properly. Is there anybody other who have encountered the same problem? You can look out my hardware from the signature.