[Bug 1875300] Re: [Ubuntu 20.04 s390] Failed to install os from CD

[Dimitri John Ledkov]

"giving the IP address in CIDR notation" is not currently supported.

I feel like I must ditch the linux kernel cmdline ip= format rules,
which is the only format supported by klibc ipconfig util in the initrd,
and instead use `ip` command to setup static IP configuration.

Specifically, that will allows to support CIDR notation.

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Title:
  [Ubuntu 20.04 s390] Failed to install os from CD

Status in subiquity:
  Invalid
Status in Ubuntu on IBM z Systems:
  Confirmed
Status in casper package in Ubuntu:
  Fix Released
Status in lvm2 package in Ubuntu:
  Fix Released
Status in casper source package in Focal:
  Confirmed
Status in lvm2 source package in Focal:
  Confirmed
Status in casper source package in Groovy:
  Fix Released
Status in lvm2 source package in Groovy:
  Fix Released

Bug description:
  Failed to install os from CD

  ---Installation Media---
  ubuntu-20.04-live-server-s390x.iso

  ---Machine type ---
  model: 8561 - T01

  
  ---Steps---
  Login to HMC
  Load CD via 'Load from Removable media or Serer'
  Select FTP
  After loaded successfully

  Get following message in Operating System Messages and installation
  failed:

  
  ln: /tmp/mountroot-fail-hooks.d//scripts/init-premount/lvm2: No such file or dir
  ectory

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