[Bug 1948884] [NEW] casper interactive_netmount looks for the wrong url on 20.04.3

[Keno Fischer]

Public bug reported:

In
https://git.launchpad.net/ubuntu/+source/casper/tree/scripts/casper?id=57382352df0fd500aeb132bfd3373c8463a7b46d#n385,
casper attempts to construct the iso URL for an interactive_netmount as

```
            case $DPKG_ARCH in
                amd64)
                    server_url=https://releases.ubuntu.com/$UBUNTU_CODENAME/ubuntu-$VERSION_ID-live-server-$DPKG_ARCH.iso
                    desktop_url=https://releases.ubuntu.com/$UBUNTU_CODENAME/ubuntu-$VERSION_ID-desktop-$DPKG_ARCH.iso
                    ;;
                *)
                    server_url=http://cdimage.ubuntu.com/releases/$UBUNTU_CODENAME/release/ubuntu-$VERSION_ID-live-server-$DPKG_ARCH.iso
                    desktop_url=http://cdimage.ubuntu.com/releases/$UBUNTU_CODENAME/release/ubuntu-$VERSION_ID-desktop-$DPKG_ARCH.iso
                    ;;
```

However, on Ubuntu 20.04.3, /etc/os-release in the initrd reads:

```
NAME="Ubuntu"
VERSION="20.04.3 LTS (Focal Fossa)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 20.04.3 LTS"
VERSION_ID="20.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=focal
UBUNTU_CODENAME=focal
```

i.e. VERSION_ID is 20.04. For the above URL pattern to work, the VERSION_ID would have
to be 20.04.3. As a result, the interactive_netmount functionality fails with
a 404 on 20.04.3 unless the correct url is manually typed in.

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

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https://bugs.launchpad.net/bugs/1948884

Title:
  casper interactive_netmount looks for the wrong url on 20.04.3

Status in casper package in Ubuntu:
  New

Bug description:
  In
  https://git.launchpad.net/ubuntu/+source/casper/tree/scripts/casper?id=57382352df0fd500aeb132bfd3373c8463a7b46d#n385,
  casper attempts to construct the iso URL for an interactive_netmount
  as

  ```
              case $DPKG_ARCH in
                  amd64)
                      server_url=https://releases.ubuntu.com/$UBUNTU_CODENAME/ubuntu-$VERSION_ID-live-server-$DPKG_ARCH.iso
                      desktop_url=https://releases.ubuntu.com/$UBUNTU_CODENAME/ubuntu-$VERSION_ID-desktop-$DPKG_ARCH.iso
                      ;;
                  *)
                      server_url=http://cdimage.ubuntu.com/releases/$UBUNTU_CODENAME/release/ubuntu-$VERSION_ID-live-server-$DPKG_ARCH.iso
                      desktop_url=http://cdimage.ubuntu.com/releases/$UBUNTU_CODENAME/release/ubuntu-$VERSION_ID-desktop-$DPKG_ARCH.iso
                      ;;
  ```

  However, on Ubuntu 20.04.3, /etc/os-release in the initrd reads:

  ```
  NAME="Ubuntu"
  VERSION="20.04.3 LTS (Focal Fossa)"
  ID=ubuntu
  ID_LIKE=debian
  PRETTY_NAME="Ubuntu 20.04.3 LTS"
  VERSION_ID="20.04"
  HOME_URL="https://www.ubuntu.com/"
  SUPPORT_URL="https://help.ubuntu.com/"
  BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
  PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
  VERSION_CODENAME=focal
  UBUNTU_CODENAME=focal
  ```

  i.e. VERSION_ID is 20.04. For the above URL pattern to work, the VERSION_ID would have
  to be 20.04.3. As a result, the interactive_netmount functionality fails with
  a 404 on 20.04.3 unless the correct url is manually typed in.

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