I have a similar problem. My external USB disk is named sdc on some bootups and sdg on others. I have a test (Karmic) system installed on this disk (I have now made Karmic my standard system on a fix internal drive but the problem still persists). It seems that during system initialization the USB memory card readers (SD, SF, etc), of which there are 4, are either given their designations before the USB disk, which then becomes sdg, or afterward, in which case the external disk becomes sdc. as a circumvention of the "cannot open..." error messages I use gparted to get the disk designations, then rename the pre-defined /boot/grub/device.map[-sdc or sdg] entry appropriate to the configuration. I have attached hwinfo listings of the two configurations taken 15 minutes apart.
** Attachment added: "Good configuration" http://launchpadlibrarian.net/34710808/hwinfo-OK -- update-grub reports error on inexistant device https://bugs.launchpad.net/bugs/441301 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
