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Old 06-13-2020, 10:23 AM   #1
Soli Deo Gloria
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Default Ubuntu Studio : Liquorix doesn't appear on Grub menu

I installed the Liquorix kernel on Ubuntu Studio 20.10 with the official installation instructions. After the sudo update-grub thing and reboot, it doesn't show at all on the Grub menu. I tried Boot Repair and the Grub customizer, but even there I can only see the Linux low latency kernels. If I check the installed kernels with dpkg --list | grep linux-image, I can see it there :



ii linux-image-5.4.0-26-lowlatency 5.4.0-26.30 amd64 Signed kernel image lowlatency
ii linux-image-5.4.0-33-lowlatency 5.4.0-33.37 amd64 Signed kernel image lowlatency
ii linux-image-5.6.0-18.1-liquorix-amd64 5.6-20ubuntu1~focal amd64 Linux 5.6 for 64-bit PCs
ii linux-image-liquorix-amd64 5.6-20ubuntu1~focal amd64 Linux image for liquorix on 64-bit PCs
ii linux-image-lowlatency 5.4.0.33.38 amd64 lowlatency Linux kernel image


Is it "unsigned"? (Whatever that means?) How do I make Liquorix to appear on the Grub menu in order to boot from it? This is quite frustrating, since I need to test that Kernel to see if I can improve the performance with Kontakt.




Thanks so much in advance.
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Old 06-13-2020, 03:15 PM   #2
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Is it under a submenu? ("Advanced options" I think.)
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Old 06-13-2020, 03:17 PM   #3
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I installed it yesterday because of xruns in Bitwig and it appeared directly in Grub using Debian 10. Have you looked at the forum?

https://techpatterns.com/forums/about2779.html

The dev is very helpful and answers quick.
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Old 06-14-2020, 10:06 PM   #4
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I'll write to him during this week. At least, I want to try it once to see if it makes any significant difference in my setup....
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Old 01-12-2021, 06:16 PM   #5
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did you contact the dev? I tried installing this kernel in Ubuntu Studio 20.04 and it also won't show up in Grub.
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Old 01-14-2021, 03:49 AM   #6
jjcale_guitar
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In the instructions you've read - did it say "sudo update-grub" ?

Seems to me that that's whats missing.
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Old 01-24-2021, 09:41 PM   #7
Soli Deo Gloria
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I did update the grub many times, but it never showed up... Anyway, I finally moved to Manjaro, and its stock kernel seems to be much better for realtime tasks than even Ubuntu's lowlatency one (mainly due to being the 5.10 version, which includes some substantial improvements).
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Old 02-08-2021, 10:17 PM   #8
Biscuit Trolley
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In case anyone else looking for the answer comes across this, you can add an extra entry in your custom grub section. Ubuntu's instructions are here, https://help.ubuntu.com/community/Grub2/CustomMenus

The way to do it is just to edit a text file in /etc/grub.d
This is a set of text files which contain the instructions for grub to use when booting. It's strongly advised not to change anything in here except the custom files, which are there for this purpose. Go to /etc/grub.d/40_custom and open it as root with whatever editor you like.
Can't remember off the top of my head whether there's a template in there initially or if it's empty. If it is empty, copy one of the entries in one of the other files and just replace the relevant kernel names/numbers. I use ls /boot and just copy paste from the filenames.

You might also need to edit a few lines near the top of /etc/default/grub to let your grub boot menu show. This is pretty self-explanatory, but there's plenty of documentation on it if you're unsure. Putting default=0 means your default is the first option in the list. You want to make sure the menu isn't hidden and that the timeout is something non-zero. Then when you boot it should prompt you to choose a kernel.

Once you've done those things, update-grub, and it should work.
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Old 02-09-2021, 08:09 AM   #9
shosty
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Did you approach the Liquorix team about this issue? It seems very odd that you have to edit grub manually. I have installed Liquorix (and others) on many machines and have built my own kernels in lots of distros over the years, ranging from ubuntu to gentoo, and I have never had to edit the grub manually.
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Old 02-11-2021, 10:31 PM   #10
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It's because I'm using a 3rd Gen Focusrite Scarlett interface. The drivers aren't in the mainline kernel yet so I have to use patched kernels. If I install normal kernels it's fine but this seems to be needed for custom installation. I think there is a way to compile the kernel that spits out a .deb file that installs like normal but I haven't gotten it to work yet.
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