casper and kernel log files
For debugging casper please boot with the boot option (e.g. kernel line in grub or append line in isolinux) “debug=”. At the live CD boot menu, press F6 and add debug= to the list of parameters:
append file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.gz debug=
Removing quiet and splash is generally a good idea when debugging.
The debug log file is /casper.log inside the initrd temporary filesystem, but will be copied to /var/log/casper.log in the fully booted system. The kernel log will be in /var/log/dmesg.log. If the system does not boot up, retrieving the log files for attaching to the bug report can be an exercise of its own:
- plug in an usb stick
- watch the kernel messages and look for the partition on the stick, for instance /dev/sdb1
- or check with ls /dev/sd* if you can recognize it
- mkdir /tmp/stick
- mount /dev/sdb1 /tmp/stick
- cp /casper.log /tmp/stick/
- dmesg > /tmp/stick/dmesg.txt
- umount /tmp/stick
- unplug the stick and give us the files casper.log and dmesg.txt!