[Bug 2008088] [NEW] Update motd/00-header to use os-release

[Corentin Noël]

Public bug reported:

The now recommended way to specify an OS version is in /usr/lib/os-release that is shipped with Ubuntu since a while now.
The lsb-release utility has now long switched to using os-release files https://salsa.debian.org/debian/lsb/-/commit/b05d8b6b70e5af820ddb4e651868488ed9257c17

It would be better for the motd header to look like this:

```
[ -r /usr/lib/os-release ] && . /usr/lib/os-release

if [ -z "$PRETTY_NAME" ] && [ -x /usr/bin/lsb_release ]; then
 # Fall back to using the very slow lsb_release utility
 PRETTY_NAME=$(lsb_release -s -d)
fi

printf "Welcome to %s (%s %s %s)\n" "$PRETTY_NAME" "$(uname -o)" "$(uname -r)" "$(uname -m)"
```

** Affects: base-files (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

  The now recommended way to specify an OS version is in /usr/lib/os-release that is shipped with Ubuntu since a while now.
  The lsb-release utility has now long switched to using os-release files https://salsa.debian.org/debian/lsb/-/commit/b05d8b6b70e5af820ddb4e651868488ed9257c17
  
  It would be better for the motd header to look like this:
  
  ```
- [ -r /usr/bin/os-release ] && . /usr/bin/os-release
+ [ -r /usr/lib/os-release ] && . /usr/lib/os-release
  
  if [ -z "$PRETTY_NAME" ] && [ -x /usr/bin/lsb_release ]; then
- 	# Fall back to using the very slow lsb_release utility
- 	PRETTY_NAME=$(lsb_release -s -d)
+  # Fall back to using the very slow lsb_release utility
+  PRETTY_NAME=$(lsb_release -s -d)
  fi
  
  printf "Welcome to %s (%s %s %s)\n" "$PRETTY_NAME" "$(uname -o)" "$(uname -r)" "$(uname -m)"
  ```

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https://bugs.launchpad.net/bugs/2008088

Title:
  Update motd/00-header to use os-release

Status in base-files package in Ubuntu:
  New

Bug description:
  The now recommended way to specify an OS version is in /usr/lib/os-release that is shipped with Ubuntu since a while now.
  The lsb-release utility has now long switched to using os-release files https://salsa.debian.org/debian/lsb/-/commit/b05d8b6b70e5af820ddb4e651868488ed9257c17

  It would be better for the motd header to look like this:

  ```
  [ -r /usr/lib/os-release ] && . /usr/lib/os-release

  if [ -z "$PRETTY_NAME" ] && [ -x /usr/bin/lsb_release ]; then
   # Fall back to using the very slow lsb_release utility
   PRETTY_NAME=$(lsb_release -s -d)
  fi

  printf "Welcome to %s (%s %s %s)\n" "$PRETTY_NAME" "$(uname -o)" "$(uname -r)" "$(uname -m)"
  ```

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