[Bug 2154013] Re: "sudo chown root: /some/dir" no longer updates the group.

[Collin Funk]

** Package changed: coreutils (Ubuntu) => rust-coreutils (Ubuntu)

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Title:
  "sudo chown root: /some/dir" no longer updates the group.

Status in rust-coreutils package in Ubuntu:
  Confirmed

Bug description:
  The chown command no longer updates the group when using `chown
  OWNER:`. In every prior version of Ubuntu, this would properly update
  the files/folders to `OWNER:OWNER` for example. Instead, now group
  remains unchanged. The new rust-coreutils on Ubuntu 26.04 breaks this
  historical behavior. For example:

  ```bash
  $ mkdir /tmp/chown-test
  $ ls -l /tmp/ | grep chown-test
  drwxrwxr-x 2 ubuntu ubuntu 40 May 22 15:10 chown-test

  $ sudo chown root: /tmp/chown-test/
  $ ls -l /tmp/ | grep chown-test
  drwxrwxr-x 2 root ubuntu 40 May 22 15:10 chown-test

  $ sudo chown root:root /tmp/chown-test/
  $ sudo chown ubuntu: /tmp/chown-test/
  $ ls -l /tmp/ | grep chown-test
  drwxrwxr-x 2 ubuntu root 40 May 22 15:10 chown-test
  ```

  chown should (and used to) update the owner of `/tmp/chown-test` to
  `root root` and `ubuntu ubuntu` respectively.

  Packages:

  ```bash
  $ lsb_release -a
  No LSB modules are available.
  Distributor ID: Ubuntu
  Description:    Ubuntu 26.04 LTS
  Release:        26.04
  Codename:       resolute

  $ dpkg -l | grep coreutils
  ii  coreutils                               9.5-1ubuntu2+0.0.0~ubuntu25                all          coreutils meta package
  ii  coreutils-from-uutils                   0.0.0~ubuntu25                             all          coreutils from the uutils project
  ii  gnu-coreutils                           9.7-3ubuntu2                               amd64        GNU core utilities
  ii  rust-coreutils                          0.8.0-0ubuntu3                             amd64        Universal coreutils utils, written in Rust
  ```

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