- Bootsplash
The Bootsplash screen don't work on AMD64. The screen stays black until you are presented with the login dialog. As far as I understand it, Kubunt uses VESA for displaying the bootscreen and the VESA driver in the kernel dont support AMD64. It should be mentioned somewhere in the installation or in the documentation. - Firefox
Several plugins for Firefox like Flash and Java don't work with Firefox 64-bit that is installed. Well, it's not Kubuntu developers fault, but I think there should be an option to install Firefox 32-bit because everything then would work. There are unsupported ways like nswrapperplugin and Firefox32. - KMilo
KMilo is a KDE Service that would make your keyboard multimedia keys work. Kubuntu uses KDE 3.5.8 and KMilo in that version has bugs that, for instance, won´t let you change the volyme more than between 0% - 11%. - Dolphin
Dolphin is the default file manager in Kubuntu 7.10. The version in Kubuntu is unmature, buggy, unsupported and lacks functions that all file manager should have. If you want a real file manager look at Krusader. - Strigi
Strigi is a desktop search program which will scan and index files in your home folder so that you later can search for file names or/and contents. Strigi is installed by default and would be OK if only it worked. Strigi wasn't able to finish indexing the files and I couldn't search for any information, because it just kept crashing. - Amarok and Kid3
Amarok is a music organiser and player. Kid3 is a program to add and edit the metadata in music files. Neither of the programs can show coverart that are embedded in the ID3 tag of MP3 files. The images will be displayed distordered while Easytag display them just fine. This could be a bug in Taglib or some other library used by KDE and Amarok. - DLink DWL-G122 Wireless network card
DWL-G122 is a wireless USB network card. Despite claims on the forum that it would work in Kubuntu 7.10 with default drivers, it dosen't work for me. When I insert DWL-G122, Kubuntu will load the drivers and it seems OK but I can not connect to my router. The solution for me was to download and compile the driver from serialmonkey.com. Because that worked, Kubuntu should use that driver instead.