Public bug reported:

Since the latest update from udev_237-3ubuntu10.25 and
systemd_237-3ubuntu10.25 to udev_237-3ubuntu10.26 and
systemd_237-3ubuntu10.26 the renaming of network interfaces by
/etc/udev/rules/70-persistent-network.rules does not work.

/etc/udev/rules/70-persistent-network.rules:
SUBSYSTEM=="net", ACTION=="add", ATTR{address}=="00:30:18:cb:5b:55", NAME="eth0"
SUBSYSTEM=="net", ACTION=="add", ATTR{address}=="00:30:18:cb:5b:56", NAME="eth1"

/var/log/syslog:
systemd-udevd[423]: Error changing net interface name 'eth1' to 'eth0': File 
exists

When I downgrade the packages to the version with 237-3ubuntu10.25 the 
following messages are in /var/log/syslog:
Sep  4 13:10:09 brutus kernel: [    4.518507] igb 0000:04:00.0 rename2: renamed 
from eth0
Sep  4 13:10:09 brutus kernel: [    4.565081] igb 0000:07:00.0 eth0: renamed 
from eth1

The latest version does not rename the interfaces temporary if there is
a conflict!

Manually installing the old packages with 
dpkg -i libacl1_2.2.52-3_amd64.deb libsystemd0_237-3ubuntu10.25_amd64.deb 
libudev1_237-3ubuntu10.25_amd64.deb systemd_237-3ubuntu10.25_amd64.deb 
systemd-sysv_237-3ubuntu10.25_amd64.deb udev_237-3ubuntu10.25_amd64.deb
did fix the problem temporary.

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: regression-update systemd udev

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https://bugs.launchpad.net/bugs/1842651

Title:
  Regression: after Uprade from udev_237-3ubuntu10.25 to
  udev_237-3ubuntu10.26 network interfaces don't get renamed by 70
  -persistent-network.rules

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