This morning I followed these instructions to upgrade Ubuntu to a development release of 22.04 and the kernel to 5.16.11. I was hoping that a bug would be fixed, but it turn out not.

I was previously on 21.10:

$ lsb_release -a
LSB Version:	core-11.1.0ubuntu3-noarch:printing-11.1.0ubuntu3-noarch:security-11.1.0ubuntu3-noarch
Distributor ID:	Ubuntu
Description:	Ubuntu 21.10
Release:	21.10
Codename:	impish

with kernel 5.15.0-rc7:

$ uname -r
5.15.0-051500rc7-generic

I upgraded to a development branch of Ubuntu 22.04:

$ lsb_release -a
LSB Version:	core-11.1.0ubuntu3-noarch:printing-11.1.0ubuntu3-noarch:security-11.1.0ubuntu3-noarch
Distributor ID:	Ubuntu
Description:	Ubuntu Jammy Jellyfish (development branch)
Release:	22.04
Codename:	jammy

and to a stable kernel version 5.16.11:

$ uname -r
5.16.11-051611-generic

If I find any issues, I'll mention them here.

Notes

The following are some notes of errors and interesting observations during the upgrade process.

Third party repository error

During the upgrade process, I notice the following error:

E: The repository 'http://ppa.launchpad.net/gezakovacs/ppa/ubuntu impish Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

This was caused because I installed UNetbootin from the above third party repository, which doesn't support all releases.

Failure upgrading installed packages

When running sudo apt-get upgrade, the system rebooted and I had to re-run the command and follow some recovery instructions to run:

$ sudo dpkg --configure -a
$ sudo apt-get upgrade
$ sudo apt --fix-broken install

Re-running sudo apt-get upgrade then succeeded.

Upgrading the distribution

Towards the end of sudo apt-get dist-upgrade, I notice the following output:

update-initramfs: Generating /boot/initrd.img-5.15.0-051500rc7-generic
update-initramfs: Generating /boot/initrd.img-5.13.0-30-generic
update-initramfs: Generating /boot/initrd.img-5.13.0-28-generic

So it seems the distribution upgrade is preserving my current kernel version as well as a couple of previously installed kernel versions.

Later, the following output:

* dkms: running auto installation service for kernel 5.15.0-18-generic

showed the upgrade was installing a later 5.15 kernel.