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A year or so ago I installed 18.04 Now I've installed 18.04.3 18.04.2 and finally 18.04 to an other hard disk on the same PC and the kernel is always 5.0.0-27-generic, how can I get back the 4.xxx that originally came with 18.04 (and 18.04.1 and 18.04.2, according to google wisdom 5.xxx was introduced with 18.04.3).

I've got a third party closed source library that fails to install on kernel 5 and I've traced the problem to a changed header file in that comes with the kernel. (Linux 5.0: macro "access_ok" passed 3 arguments, but takes just 2).

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It is quite easy. Run in a terminal:

sudo apt install linux-generic

That will install the 4.15 kernel and related meta packages.

Then boot with that kernel using grub menu and remove all 5.0 kernel packages.

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  • are there security risks and bug issues in using 4.15? I posted elsewhere you answered about a wifi adapter and this: github.com/nazar-pc/RTL8814AU only supports up to 4.16 so I was going to downgrade but hesitating. – mLstudent33 Sep 15 '20 at 17:45
  • There are no risks of using the 4.15 kernel on 18.04 because it is a supported non-HWE kernel. But there are drivers that are available for current kernels too. – Pilot6 Sep 15 '20 at 17:53
  • I saw this: askubuntu.com/questions/1185952/…. I Googled, "ac68 driver for kernel 5". Can you assist? I'm on Ubuntu 18.04 – mLstudent33 Sep 15 '20 at 17:55
  • I have no idea what ac68 is. If it is an RTL8814 device, then search for current drivers. – Pilot6 Sep 15 '20 at 17:56
  • it's this adapter: asus.com/ca-en/Networking/USB-AC68/HelpDesk_Download The download with Linux drivers have errors on both ./install.sh and sudo make && sudo make install which I have contacted ASUS about but I will search for Realtek now, thanks. – mLstudent33 Sep 15 '20 at 17:58

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