[Bug 1910155] [NEW] Installation manual network config fails with "x.x.x.x is not in contained in x.x.x.x/yy"

[Leon Castellanos]

Public bug reported:

1) lsb_release -rd

Description:	Ubuntu 20.04.1 LTS
Release:	20.04

2) Package version
Unknown. Whatever version is part of ubuntu-20.04.1-live-server-amd64.iso 2020-07-31 17:35

3) What I expected

For valid manual network settings to work.

4) What happened instead

Manual network configuration fails saying:

"'xxx.xxx.17.114' is not contained in '255.255.254.0/23'"

With network settings:

Subnet: 255.255.254.0/23
Address: xxx.xxx.17.114
Gateway: xxx.xxx.16.1

Subnet certainly contains xxx.xxx.16.1 - xxx.xxx.17.254

We attempted to define /23 on Address instead, but that is not allowed.

I work for NASA GSFC and we're having to proceed without network and
then manually edit /etc/netplan/*.yaml after install.

If this is an error on our part, can you please clarify what we were
supposed to enter for subnet? Since Subnet line requires an entry in
CIDR form with error "should be in CIDR form (xx.xx.xx.xx/yy)"

Manual network config works fine with:

# This is the network config written by 'subiquity'
network:
  version: 2
  renderer: networkd
  ethernets:
    enp49s0f1:
      dhcp4: no
      addresses:
        - xxx.xxx.17.114/23
      gateway4: xxx.xxx.16.1
      nameservers:
          addresses: [xxx.xxx.10.134, xxx.xxx.50.17]

**IPs redacted for security purposes

** Affects: subiquity (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "Subnet calculation error"
   https://bugs.launchpad.net/bugs/1910155/+attachment/5449278/+files/Ubuntu-installer-subnet-error.jpg

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https://bugs.launchpad.net/bugs/1910155

Title:
  Installation manual network config fails with "x.x.x.x is not in
  contained in x.x.x.x/yy"

Status in subiquity package in Ubuntu:
  New

Bug description:
  1) lsb_release -rd

  Description:	Ubuntu 20.04.1 LTS
  Release:	20.04

  2) Package version
  Unknown. Whatever version is part of ubuntu-20.04.1-live-server-amd64.iso 2020-07-31 17:35

  3) What I expected

  For valid manual network settings to work.

  4) What happened instead

  Manual network configuration fails saying:

  "'xxx.xxx.17.114' is not contained in '255.255.254.0/23'"

  With network settings:

  Subnet: 255.255.254.0/23
  Address: xxx.xxx.17.114
  Gateway: xxx.xxx.16.1

  Subnet certainly contains xxx.xxx.16.1 - xxx.xxx.17.254

  We attempted to define /23 on Address instead, but that is not
  allowed.

  I work for NASA GSFC and we're having to proceed without network and
  then manually edit /etc/netplan/*.yaml after install.

  If this is an error on our part, can you please clarify what we were
  supposed to enter for subnet? Since Subnet line requires an entry in
  CIDR form with error "should be in CIDR form (xx.xx.xx.xx/yy)"

  Manual network config works fine with:

  # This is the network config written by 'subiquity'
  network:
    version: 2
    renderer: networkd
    ethernets:
      enp49s0f1:
        dhcp4: no
        addresses:
          - xxx.xxx.17.114/23
        gateway4: xxx.xxx.16.1
        nameservers:
            addresses: [xxx.xxx.10.134, xxx.xxx.50.17]

  **IPs redacted for security purposes

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