** Description changed:

  In all our unprivileged LXC containers running Bionic Beaver, installing
  systemd 237-3ubuntu10.39 results in losing network configuration.
  
  It is still possible to configure the network "by hand" with
  /usr/sbin/ip, but of course, the configuration is lost at reboot.
  
+ A complete procedure to reproduce the issue is here:
+ https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1863873/comments/6
+  
  Hosts:
  
  Debian Buster
- custom 5.3.9, 5.4.8 or 5.4.13 kernel
+ default 4.19.0-6-amd64, custom 5.3.9, 5.4.8 or 5.4.13 kernel
  
  Example container network configuration:
  
  lxc.net.0.type = veth
  lxc.net.0.veth.pair = vps525389
  lxc.net.0.flags = up
  lxc.net.0.link = br0
  lxc.net.0.hwaddr = 02:00:00:52:53:89
  lxc.net.0.name = eth0
  lxc.net.0.ipv4.gateway = 192.168.252.1
  lxc.net.0.ipv4.address = 192.168.252.177/32
  
  Steps to reproduce, inside the container:
  
  root@vps525389:~# lsb_release -rd
  Description:    Ubuntu 18.04.4 LTS
  Release:        18.04
  root@vps525389:~# apt-cache policy systemd
  systemd:
-   Installed: 237-3ubuntu10.38
-   Candidate: 237-3ubuntu10.39
-   Version table:
-      237-3ubuntu10.39 500
-         500 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 
Packages
-  *** 237-3ubuntu10.38 500
-         500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 
Packages
-         100 /var/lib/dpkg/status
-      237-3ubuntu10 500
-         500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
+   Installed: 237-3ubuntu10.38
+   Candidate: 237-3ubuntu10.39
+   Version table:
+      237-3ubuntu10.39 500
+         500 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 
Packages
+  *** 237-3ubuntu10.38 500
+         500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 
Packages
+         100 /var/lib/dpkg/status
+      237-3ubuntu10 500
+         500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
  root@vps525389:~# ip a
  1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
-     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
-     inet 127.0.0.1/8 scope host lo
-        valid_lft forever preferred_lft forever
-     inet6 ::1/128 scope host
-        valid_lft forever preferred_lft forever
+     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
+     inet 127.0.0.1/8 scope host lo
+        valid_lft forever preferred_lft forever
+     inet6 ::1/128 scope host
+        valid_lft forever preferred_lft forever
  1958: eth0@if1959: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue 
state UP group default qlen 1000
-     link/ether 02:00:00:52:53:89 brd ff:ff:ff:ff:ff:ff link-netnsid 0
-     inet 192.168.252.177/32 brd 255.255.255.255 scope global eth0
-        valid_lft forever preferred_lft forever
-     inet6 xxxx:xxxx:x:xx::x:xxxx/128 scope global
-        valid_lft forever preferred_lft forever
-     inet6 xxxx::xx:xxxx:xxxx/64 scope link
-        valid_lft forever preferred_lft forever
+     link/ether 02:00:00:52:53:89 brd ff:ff:ff:ff:ff:ff link-netnsid 0
+     inet 192.168.252.177/32 brd 255.255.255.255 scope global eth0
+        valid_lft forever preferred_lft forever
+     inet6 xxxx:xxxx:x:xx::x:xxxx/128 scope global
+        valid_lft forever preferred_lft forever
+     inet6 xxxx::xx:xxxx:xxxx/64 scope link
+        valid_lft forever preferred_lft forever
  root@vps525389:~# apt install systemd
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done
  The following additional packages will be installed:
-   libnss-systemd libpam-systemd libsystemd0
+   libnss-systemd libpam-systemd libsystemd0
  Suggested packages:
-   systemd-container policykit-1
+   systemd-container policykit-1
  The following packages will be upgraded:
-   libnss-systemd libpam-systemd libsystemd0 systemd
+   libnss-systemd libpam-systemd libsystemd0 systemd
  4 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.
  Need to get 3330 kB of archives.
  After this operation, 7168 B of additional disk space will be used.
  Do you want to continue? [Y/n]
  Get:1 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 
libnss-systemd amd64 237-3ubuntu10.39 [104 kB]
  Get:2 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 
libpam-systemd amd64 237-3ubuntu10.39 [107 kB]
  Get:3 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 systemd 
amd64 237-3ubuntu10.39 [2912 kB]
  Get:4 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libsystemd0 
amd64 237-3ubuntu10.39 [206 kB]
  Fetched 3330 kB in 3s (1274 kB/s)
  (Reading database ... 18195 files and directories currently installed.)
  Preparing to unpack .../libnss-systemd_237-3ubuntu10.39_amd64.deb ...
  Unpacking libnss-systemd:amd64 (237-3ubuntu10.39) over (237-3ubuntu10.38) ...
  Preparing to unpack .../libpam-systemd_237-3ubuntu10.39_amd64.deb ...
  Unpacking libpam-systemd:amd64 (237-3ubuntu10.39) over (237-3ubuntu10.38) ...
  Preparing to unpack .../systemd_237-3ubuntu10.39_amd64.deb ...
  Unpacking systemd (237-3ubuntu10.39) over (237-3ubuntu10.38) ...
  Preparing to unpack .../libsystemd0_237-3ubuntu10.39_amd64.deb ...
  Unpacking libsystemd0:amd64 (237-3ubuntu10.39) over (237-3ubuntu10.38) ...
  Setting up libsystemd0:amd64 (237-3ubuntu10.39) ...
  Setting up systemd (237-3ubuntu10.39) ...
  Setting up libnss-systemd:amd64 (237-3ubuntu10.39) ...
  Setting up libpam-systemd:amd64 (237-3ubuntu10.39) ...
  Processing triggers for dbus (1.12.2-1ubuntu1.1) ...
  Processing triggers for libc-bin (2.27-3ubuntu1) ...
  root@vps525389:~# ip a
  1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
-     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
-     inet 127.0.0.1/8 scope host lo
-        valid_lft forever preferred_lft forever
-     inet6 ::1/128 scope host
-        valid_lft forever preferred_lft forever
+     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
+     inet 127.0.0.1/8 scope host lo
+        valid_lft forever preferred_lft forever
+     inet6 ::1/128 scope host
+        valid_lft forever preferred_lft forever
  1958: eth0@if1959: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue 
state UP group default qlen 1000
-     link/ether 02:00:00:52:53:89 brd ff:ff:ff:ff:ff:ff link-netnsid 0
-     inet6 fe80::ff:fe52:5389/64 scope link
-        valid_lft forever preferred_lft forever
+     link/ether 02:00:00:52:53:89 brd ff:ff:ff:ff:ff:ff link-netnsid 0
+     inet6 fe80::ff:fe52:5389/64 scope link
+        valid_lft forever preferred_lft forever

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https://bugs.launchpad.net/bugs/1863873

Title:
  Systemd fails to configure bridged network in LXC container

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