I have installed Knoppix 7.2 to the HDD of an old laptop (Pentium 2 mobile CPU @ 300Mhz and 200 Mb ram). All works pretty well considering the low spec. I installed a few things fine then I did a mark all upgrades in synaptic. The upgrade failed and now it's broken and anything I try to install fails. I have trawled the forums and saw reference that you should not try to upgrade the installed packages. What have I done, why shouldn't I have done it and can I fix this. My Linux knowledge is beginner. Many thanks.