I’ve had one heck of a hard time getting the SD card to mount on my Ubuntu Karmic Dell Precision 90 laptop. Not a thing. Searched through the forums and found a solution that worked for me. Now the SD Card mounts on my Dell Laptop just fine. Just takes a quick command-line call and a cut-and-paste into “gedit”. Once the edit is made, close and reboot, and the SD card problem with your Ubuntu Karmic Koala is gone!
First, at a command line, do:
sudo gedit /etc/modprobe.d/options
Then, in gedit, cut and paste:options sdhci debug_quirks=1 ProblemType: Bug Architecture: i386 DistroRelease: Ubuntu 9.04 Package: linux-image-2.6.28-6-generic 2.6.28-6.17 ProcCmdLine: User Name=UUID=e309fb14-05db-4e9a-b137-c6bf63eeb6a4 ro quiet splash elevator=noop ProcEnviron: SHELL=/bin/bash LANG=it_IT.UTF-8 ProcVersionSignature: Ubuntu 2.6.28-6.17-generic SourcePackage: linux
Save the file, then reboot.
Your SD Card should show up.