Public bug reported:
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
```
** Affects: coreutils (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2154013
Title:
"sudo chown root: /some/dir" no longer updates the group.
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