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.
Lenovo 500w Gen 3 Laptop, 11.6" IPS Glass, N6000, 8GB, 128GB SSD, Win 11 Home
$199.00
Lenovo ThinkPad E15, i5, 8GB RAM, 256GB SSD, No OS, 20RD005HUS
$180.00
Lenovo Notebook ThinkPad L13 Yoga Gen 3 Laptop, 13.3" IPS 60Hz, i7-1255U, 16GB
$607.99
Lenovo - Ideapad 3i 15.6" FHD Touch Laptop - Core i5-1155G7 with 8GB Memory -...
$349.99
Lenovo Legion Pro 5i 16" Gaming Laptop RTX 4070 8GB i9-13900HX 16GB RAM 1TB SSD
$1399.99
Lenovo ThinkPad 15.6” FHD Laptop PC Core i7 16GB RAM 256GB SSD Windows 10 HDMI
$252.19
Lenovo Ideapad 1 15Amn7 15.6" Laptop Ryzen 3 7320U 8GB 256GB SSD W11H-64
$199.99
Lenovo Ideapad 3 15IIL05 15.6" Core I3-1005G1 1.2GHz 8GB 256GB SSD Win11
$99.95
Lenovo ThinkPad L15 Gen 2 15.6” FHD Laptop Core i5 16GB RAM 512GB SSD Windows 10
$281.29
Lenovo Notebook ThinkPad L14 Gen 1 Laptop, 14" FHD IPS, Ryzen 5 PRO 4650U, 16GB
$332.00