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[Dimitri John Ledkov <launchpad@xxxxxxxxxxxx>]

1) cloud-init should be fixed for /run/netplan/* which is another bug
2) this bug is about subiquity not deleting/tearing down critical connections

** This bug is no longer a duplicate of bug 1861460
   cloud-init should parse initramfs rendered netplan if present

** Changed in: cloud-init
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1868246

Title:
  No network after subiquity LPAR installation on s390x with VLAN

Status in cloud-init:
  Invalid
Status in subiquity:
  New
Status in Ubuntu on IBM z Systems:
  New

Bug description:
  I tried today an subiquity LPAR installation using the latest ISO (March 19) that includes the latest 20.03 subiquity.
  The installation itself completed fine, but after the post-install reboot the system didn't had a network active - please note that the LPAR is connected to a VLAN.

  $ ip a                                                           
  1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group defaul
  t 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> mtu 1500 qdisc noop state DOWN group default q
  len 1000                                                                        
      link/ether a2:8d:91:85:12:e3 brd ff:ff:ff:ff:ff:ff                          
  3: enP1p0s0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default 
  qlen 1000                                                                       
      link/ether 82:0c:2d:0c:b8:70 brd ff:ff:ff:ff:ff:ff                          
  4: enP1p0s0d1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group defaul
  t qlen 1000                                                                     
      link/ether 82:0c: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 82:0c:2d:0c:b7:00 brd ff:ff:ff:ff:ff:ff                          
  6: enP2p0s0d1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group defaul
  t qlen 1000                                                                     
      link/ether 82:0c:2d:0c:b7:01 brd ff:ff:ff:ff:ff:ff   

  Wanting to have a look at the netplan config it turned out that there is no yaml file:
  $ ls -l /etc/netplan/                                            
  total 0          

  Adding one manually and applying it worked fine.

  So looks like the installer does not properly generate or copy a
  01-netcfg.yaml to /etc/netplan.

  Please see below the entire steps as well as a compressed file with
  the entire content of /var/log

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