ip addr output when the network is good:
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
2: encc000: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group 
default qlen 1000
    link/ether 2a:55:61:1d:aa:38 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::2855:61ff:fe1d:aa38/64 scope link 
       valid_lft forever preferred_lft forever
3: enP1p0s0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default 
qlen 1000
    link/ether 82:0a:2d:0c:b8:70 brd ff:ff:ff:ff:ff:ff
4: enP1p0s0d1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group 
default qlen 1000
    link/ether 82:0a:2d:0c:b8:71 brd ff:ff:ff:ff:ff:ff
5: enP2p0s0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default 
qlen 1000
    link/ether 82:0a:2d:0c:b7:00 brd ff:ff:ff:ff:ff:ff
6: enP2p0s0d1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group 
default qlen 1000
    link/ether 82:0a:2d:0c:b7:01 brd ff:ff:ff:ff:ff:ff
7: encc000.2586@encc000: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc 
noqueue state UP group default qlen 1000
    link/ether 2a:55:61:1d:aa:38 brd ff:ff:ff:ff:ff:ff
    inet 10.245.80.42/22 brd 10.245.83.255 scope global encc000.2586
       valid_lft forever preferred_lft forever
    inet6 fe80::2855:61ff:fe1d:aa38/64 scope link 
       valid_lft forever preferred_lft forever
8: lxcbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state 
DOWN group default qlen 1000
    link/ether 00:16:3e:00:00:00 brd ff:ff:ff:ff:ff:ff
    inet 10.0.3.1/24 scope global lxcbr0
       valid_lft forever preferred_lft forever
9: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state 
DOWN group default qlen 1000
    link/ether 52:54:00:4c:f5:88 brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
       valid_lft forever preferred_lft forever
10: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc fq_codel master virbr0 
state DOWN group default qlen 1000
    link/ether 52:54:00:4c:f5:88 brd ff:ff:ff:ff:ff:ff


The difference is here:
7: encc000.2586@encc000: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc 
noqueue state UP group default qlen 1000
    link/ether 2a:55:61:1d:aa:38 brd ff:ff:ff:ff:ff:ff
    inet 10.245.80.42/22 brd 10.245.83.255 scope global encc000.2586
       valid_lft forever preferred_lft forever
    inet6 fe80::2855:61ff:fe1d:aa38/64 scope link 
       valid_lft forever preferred_lft forever

** Attachment added: "dmesg-network-ok.log"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1860421/+attachment/5321891/+files/dmesg-network-ok.log

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https://bugs.launchpad.net/bugs/1860421

Title:
  Sometime the Eoan s390x LPAR can't get an IP address after reboot

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