The kernel log suggests the nouveau kernel driver is having trouble:
[ 5703.539644] nouveau 0000:00:0d.0: bus: MMIO write of 052a0001 FAULT at 00b000
[ 5704.875835] nouveau 0000:00:0d.0: bus: MMIO write of 05270001 FAULT at 00b010
[ 5705.738769] nouveau 0000:00:0d.0: bus: MMIO write of 05270001 FAULT at 00b010
[ 5705.740773] nouveau 0000:00:0d.0: bus: MMIO write of 05270001 FAULT at 00b010
[ 5712.157743] rfkill: input handler disabled
[ 5713.532579] nouveau 0000:00:0d.0: bus: MMIO write of 08c70001 FAULT at 00b020
[ 5723.226473] nouveau 0000:00:0d.0: bus: MMIO write of 0a4c0001 FAULT at 00b030
[ 5723.241081] nouveau 0000:00:0d.0: bus: MMIO write of 00000000 FAULT at 00b030
[ 5763.349926] nouveau 0000:00:0d.0: bus: MMIO write of 0c450001 FAULT at 00b030
[ 5767.257346] nouveau 0000:00:0d.0: bus: MMIO write of 00000000 FAULT at 00b030
[ 5860.400801] nouveau 0000:00:0d.0: bus: MMIO write of 0a4e0001 FAULT at 00b030
[ 5860.462603] nouveau 0000:00:0d.0: bus: MMIO write of 00000000 FAULT at 00b030
[ 5877.109887] nouveau 0000:00:0d.0: bus: MMIO write of 0a4e0001 FAULT at 00b030
[ 5877.130526] nouveau 0000:00:0d.0: bus: MMIO write of 00000000 FAULT at 00b030
To verify if that is the main problem, please try installing the
proprietary Nvidia driver instead via:
Software & Updates > Additional Drivers > ...
** Tags added: nouveau
** Summary changed:
- Freezing system
+ [nouveau] Freezing system
** Package changed: xorg (Ubuntu) => ubuntu
** Changed in: ubuntu
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1844860
Title:
[nouveau] Freezing system
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