I believe this is because in systemd v250 (which is in between 22.04's systemd v249, and 24.04's systemd v255), a network interface naming scheme was added for Xen netfront interfaces[1].
So, basically, udev is using a different name for the interface now. One way to work around this in the future would be to set your own interface name using the netplan config. By default, udev's policy is to keep interface names that were set by the admin. [1] https://www.freedesktop.org/software/systemd/man/latest/systemd.net- naming-scheme.html#v250 ** Changed in: systemd (Ubuntu) Status: New => Confirmed ** Changed in: systemd (Ubuntu) Importance: Undecided => Low -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/2092945 Title: upgrade from 22 to 24 broke static ip Status in systemd package in Ubuntu: Confirmed Bug description: In the past week, I upgraded three machines using do-release-upgrade from Ubuntu server 22 to 24. All had static IPs configured: #1 with /etc/network/interfaces (oldschool!) (hostname=ocelot) #2 /etc/netplan/00-installer-config.yaml (as originally created by subiquity) (hostname=toolbox) #3 /etc/netplan/90-config.yaml (hostname=couch) All were simple (physical) configurations: just one ethernet interface, one network. (plus docker in #2-3, plus some ppp's in #3). #3 also had multiple IPs bound to eth0 (to enable routing by source ip addr) #1-2 are running as a vm under the same xen hypervisor (ubuntu 22.04.3), #3 runs bare-metal (dell xeon) In cases #1-2, the config file was NOT updated from 'eth0' to 'enX0' and the machine did not come back on the network. Luckily, I had access to the console, or I'd be screwed. In case #3, 'eth0' is still the configured interface. So... I guess it's xen related, then? Note the hypervisor (host os) did not change, only the guest vm was upgraded from 22 to 24. #1 hvm ``` $ cat ocelot.hvm builder = "hvm" name = "ocelot-hvm" memory = "1024" vcpus = 1 vif = [''] #disk = ['phy:/dev/lvg/ocelot-root,hda,w','file:/root/dmg/ubuntu-16.04.3-server-amd64.iso,hdc:cdrom,r'] # lol, long upgrade history here! disk = ['phy:/dev/lvg/ocelot-root,hda,w'] vnc = 1 boot="dc" ``` #2 hvm ``` $ cat toolbox.hvm builder = "hvm" name = "toolbox-hvm" memory = "3072" vcpus = 1 vif = [''] #disk = ['phy:/dev/lvg/toolbox-root,hda,w','file:/root/dmg/ubuntu-20.04.4-live-server-amd64.iso,hdc:cdrom,r'] disk = ['phy:/dev/lvg/toolbox-root,hda,w'] vnc = 1 boot="dc" ``` To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/2092945/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
