[Bug 2127231] Re: /usr/bin/b3sum is a dangling symlink

[Keith Thompson]

I get this on Ubuntu 25.10:

```
$ b2sum /dev/null
786a02f742015903c6c6fd852552d272912f4740e15847618a86e217f71f5419d25e1031afee585313896444934eb04b903a685b1448b755d56f701afe9be2ce  /dev/null
$ coreutils b2sum /dev/null
786a02f742015903c6c6fd852552d272912f4740e15847618a86e217f71f5419d25e1031afee585313896444934eb04b903a685b1448b755d56f701afe9be2ce  /dev/null
$ b3sum /dev/null
Command 'b3sum' not found, but can be installed with:
sudo apt install coreutils-from-uutils  # version 0.0.0~ubuntu24, or
sudo apt install b3sum                  # version 1.8.1-2
$ coreutils b3sum /dev/null
af1349b9f5f9a1a6a0404dea36dcc9499bcb25c9adc112b7cc9a93cae41f3262  /dev/null
$ coreutils --version
coreutils 0.2.2 (multi-call binary)
$· 
```

gnu-coreutils provides b2sum but not b3sum.  
rust-coreutils provides both.

rust-coreutils provides several other commands that gnu-coreutils does
not. If Ubuntu is going to be using rust-coreutils primarily, I suggest
it makes sense to provide symlinks based on that rather than restricting
the system to commands provided by gnu-coreutils.

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https://bugs.launchpad.net/bugs/2127231

Title:
  /usr/bin/b3sum is a dangling symlink

Status in coreutils-from package in Ubuntu:
  Triaged

Bug description:
  A number of checksum commands are installed as symlinks in /usr/bin, 
  pointing to the uutils command in ../lib/cargo/bin/coreutils .
   
  uutils normally provides both "b2sum" and "b3sum" commands, but 
  b3sum is missing in Ubuntu 25.10.

  $ ls -l /usr/bin/b2sum /usr/bin/b3sum 
  lrwxrwxrwx 1 root root 32 Sep 26 11:16 /usr/bin/b2sum -> ../lib/cargo/bin/coreutils/b2sum
  lrwxrwxrwx 1 root root 32 Sep 26 11:16 /usr/bin/b3sum -> ../lib/cargo/bin/coreutils/b3sum
  $ ls -lL /usr/bin/b2sum /usr/bin/b3sum 
  ls: cannot access '/usr/bin/b3sum': No such file or directory
  -rwxr-xr-x 115 root root 10828088 Sep 24 08:36 /usr/bin/b2sum
  $

  ProblemType: Bug
  DistroRelease: Ubuntu 25.10
  Package: coreutils-from-uutils 0.0.0~ubuntu24
  Uname: Linux 6.6.87.2-microsoft-standard-WSL2 x86_64
  ApportVersion: 2.33.1-0ubuntu3
  Architecture: amd64
  CasperMD5CheckResult: unknown
  Date: Thu Oct  9 20:27:12 2025
  PackageArchitecture: all
  SourcePackage: coreutils-from
  UpgradeStatus: No upgrade log present (probably fresh install)

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