And here's some proposed text. I assume this would be applicable to the release notes from 20.04->22.04
= Known Issues = == Network Interface Names == Ubuntu generates [predictable interface names](https://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames/) by default. These names are influenced by the information exposed by kernel drivers, and this can therefore vary from kernel release to kernel release. For example, Mellanox Connect-X 5 adapters are known to be assigned names such as enp1s0f0 with Linux 5.4, but be assigned a name like enp1s0f0np1 in Linux >= 5.8 (bug 1940860). If you find your system is impacted by such a name change after a kernel upgrade, you will need to update your network configuration files. If you would like to retain the same network interface names when switching between kernels, [netplan](https://netplan.io/reference/) provides a "set-name" field you can apply to your interface configuration. When set, this will cause Ubuntu to use the defined name instead of the default. ** Changed in: systemd (Ubuntu) Status: New => Invalid ** Changed in: linux (Ubuntu) Status: Confirmed => Won't Fix -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1940860 Title: Mellanox NIC interface names change between 5.4 and 5.8 Status in subiquity: New Status in linux package in Ubuntu: Won't Fix Status in systemd package in Ubuntu: Invalid Bug description: I noticed on a couple of systems that my network interface names change when upgrading from the focal LTS (5.4) kernel to the focal HWE (both 5.8 & 5.11) kernels. Both systems have Mellanox Connect-X 5 NICs. dannf@bizzy:~$ uname -a Linux bizzy 5.4.0-81-generic #91-Ubuntu SMP Thu Jul 15 19:10:30 UTC 2021 aarch64 aarch64 aarch64 GNU/Linux dannf@bizzy:~$ ls /sys/class/net enp1s0f0 enp1s0f1 enx3e8734bc294f lo dannf@bizzy:~$ uname -a Linux bizzy 5.8.0-63-generic #71~20.04.1-Ubuntu SMP Thu Jul 15 17:46:44 UTC 2021 aarch64 aarch64 aarch64 GNU/Linux dannf@bizzy:~$ ls /sys/class/net enp1s0f0np0 enp1s0f1np1 enx3e8734bc294f lo dannf@bizzy:~$ uname -a Linux bizzy 5.11.0-27-generic #29~20.04.1-Ubuntu SMP Wed Aug 11 15:58:08 UTC 2021 aarch64 aarch64 aarch64 GNU/Linux dannf@bizzy:~$ ls /sys/class/net enp1s0f0np0 enp1s0f1np1 enx3e8734bc294f lo I bisected this down to a kernel change: # first bad commit: [c6acd629eec754a9679f922d51f90e44c769b80c] net/mlx5e: Add support for devlink-port in non-representors mode The impact is that your network can fail to come up after transitioning from the LTS kernel to the HWE kernel. Now, this isn't a huge problem for MAAS installs because MAAS configures netplan to always use the same names as were used at commissioning. It does impact subiquity based installs however, which do not. To manage notifications about this bug go to: https://bugs.launchpad.net/subiquity/+bug/1940860/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
