I wanted to start an ubuntu virtual machine as follows in Knoppix 7.2.0DVD (booted with 'fromhd'):
root# qemu-system-x86_64 -cdrom ubuntu-12.04.3-dvd-amd64.iso
The iso image was read OK, with the ubuntu boot screen appearing in the vga display of the emulator. However the booting failed with the following message:
[ 29.044201] BUG: soft lockup - CPU#0 stuck for 23s! [swapper/0:1]
[ 53.044186] BUG: soft lockup - CPU#0 stuck for 22s! [swapper/0:1]
[ 89.044214] BUG: soft lockup - CPU#0 stuck for 23s! [swapper/0:1]
When the iso image is burned to a DVD, the ubuntu system boots up without a problem from the disk. And "qemu-system-x86_64" starts a Knoppix VM from iso without problems. So it appears that the ubuntu iso and the qemu behaves as expected individually.
Although this problem may reside well outside the domain of Knoppix per se, I hope I may receive advice on where to go from here. Thanks in advance for any help.
VINTAGE DEC/INTERLAN inc. BD-N11010 Rev C (B1)
$189.99
Vintage DEC/CLEARPOINT INC. -QRAM-2 SAB-1 1MB Q-BUS MEMORY MSV11-QA (B2)
$129.99
VINTAGE DEC Digital 54-14636-00 AZTEC CONTROLLER MODULE (B8)
$229.99
*NEW UNOPENED* Vintage DEC LB-5923 Keyboard
$40.00
DEC PDP 8/M PDP 8M / 4 avail / Vintage Digital Equipment Corp /Also DEC PDP 12
$5775.00
Vintage DEC Digital Equipment Storage Expansion Model SZ12, Series BA42A, SZ12A
$79.00
Vintage Digital DEC DECstation Storage Expansion SCSI external enclosure
$69.95
DEC DIGITAL Equipment Corp VT220-D2 Vintage CRT Terminal
$215.00
Vintage Digital DEC M7606 KA630-AA MicroVAX-II Processor
$120.00
Vintage DEC Digital Equipment Corp PDP 11/40 G114 16K SENSE/INHIBIT (B10)
$269.99