------- Comment From [email protected] 2021-01-21 04:47 EDT-------
Try Installation UBUNTU 18.04.02

add Vlan Interface to additional Qeth device works fine for me
encbd00: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP 
group default qlen 1000
link/ether 02:00:00:13:f0:1b brd ff:ff:ff:ff:ff:ff
inet 172.18.40.17/15 brd 172.19.255.255 scope global encbd00
valid_lft forever preferred_lft forever
inet6 fe80::ff:fe13:f01b/64 scope link
valid_lft forever preferred_lft forever
24: encb000: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP 
group default qlen 1000
link/ether 02:00:00:15:0f:2c brd ff:ff:ff:ff:ff:ff
inet6 fe80::ff:fe15:f2c/64 scope link
valid_lft forever preferred_lft forever
25: encb00.202@encb000: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc 
noqueue state UP group default qlen 1000
link/ether 02:00:00:15:0f:2c brd ff:ff:ff:ff:ff:ff
inet6 fe80::ff:fe15:f2c/64 scope link
valid_lft forever preferred_lft forever
root@t83lp17:~# uname
Linux
root@t83lp17:~# uname -a
Linux t83lp17 4.15.0-132-generic #136-Ubuntu SMP Tue Jan 12 15:00:49 UTC 2021 
s390x s390x s390x GNU/Linux
root@t83lp17:~# lsb
lsblk        lsb_release
root@t83lp17:~# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 18.04.2 LTS
Release:        18.04

root@t83lp17:~# uname -a
Linux t83lp17 4.15.0-132-generic #136-Ubuntu SMP Tue Jan 12 15:00:49 UTC 2021 
s390x s390x s390x GNU/Linux
root@t83lp17:~#

Try to do an upgrade from UBUNTU18.04.01 as described from Frank,
work as well.

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https://bugs.launchpad.net/bugs/1838258

Title:
  Unable to configure VLAN on an additional OSA interface

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