Com 6.2.0-4 / Failed to create network / Wrong kernel

[Richard70]

Hello team,
I upgraded my Community version 5 to 6.2.0-4 as per the official procedure (I'm using a bare metal server).
All has been working fine for 2 weeks after the upgrade.
The problem is that since yesterday, I have a lot of issues when I try to start nodes with this error message : "Failed to create network" (in log file I get "Failed to set group_fwd_mask on bridge (80028)").
After investigations, I noticed I'm runnning the generic version of the kernel:

Welcome to Ubuntu 22.04.5 LTS (GNU/Linux 6.8.0-52-generic x86_64)

In the boot menu I tried to boot with this kernel:

Welcome to Ubuntu 22.04.5 LTS (GNU/Linux 6.7.5-eveng-6-ksm+ x86_64)

and it looks like that fixed the issue.

So my 1st question:
This issue popped up suddenly (I'm pretty sure that I was using the uksm kernel version during the last 2 weeks). So why now is it booting with the generic kernel (I haven't done any thing wrong) ?
Is it a bug ?

And my 2d question if I may:
Each time Eve boots, it reverts back to the generic kernel. How to configure Eve to boot with the correct uksm version ?

Thanks in advance.
Ric

[rusty725]

dpkg -l linux-image* | grep ii
to see installed kernels
then use :
apt remove <linux-package-name>

[Richard70]

Hello Rusty

Thanks for the suggestion.
However, when I try to remove the kernel, I get this:

You are running a kernel (version 6.8.0-52-generic) and attempting to remove the same version. This can make the system unbootable as it will remove /boot/vmlinuz-6.8.0-52-generic and all modules under the directory /lib/modules/6.8.0-52-generic.
This can only be fixed with a copy of the kernel image and the corresponding modules. It is highly recommended to abort the kernel removal unless you are prepared to fix the system after removal.

So I guess that I need to boot first with the uksm kernel choosing it manually in the grub menu.
I can do that for sure, but my question is : Will the "kernel remove" procedure set the new grub parameters so that the correct uksm kernel will load automatically by default ?
Or will I have to always go into the grub menu ?
Just being extra cautious to avoid a mess
Thanks

[rusty725]

Boot with uksm kernel , remove the 6.8 kernel, then run grub-update command , reboot and that should be it.

[Richard70]

Worked fine.
Thanks you very much.
Ric