Public bug reported:
After purging my ruby environment
```
sudo gem uninstall $(gem list --installed --no-versions)
sudo apt remove ruby* rubocop rake --yes
sudo apt autoremove --yes
sudo apt purge --yes
dpkg --list | grep ruby > /dev/null
if [ $? -eq 1 ]; then echo "no more ruby"; fi
```
And installing rubocop
```
sudo apt install rubocop ruby ruby-full
```
I get this error.
```
$ rubocop --version
/usr/lib/ruby/vendor_ruby/rubygems/defaults/operating_system.rb:10: warning:
constant Gem::ConfigMap is deprecated
/usr/lib/ruby/vendor_ruby/rubygems/defaults/operating_system.rb:10: warning:
constant Gem::ConfigMap is deprecated
/usr/lib/ruby/vendor_ruby/rubygems/defaults/operating_system.rb:29: warning:
constant Gem::ConfigMap is deprecated
/usr/lib/ruby/vendor_ruby/rubygems/defaults/operating_system.rb:30: warning:
constant Gem::ConfigMap is deprecated
Traceback (most recent call last):
10: from /usr/bin/rubocop:6:in `<main>'
9: from
/usr/local/lib/site_ruby/2.5.0/rubygems/core_ext/kernel_require.rb:85:in
`require'
8: from
/usr/local/lib/site_ruby/2.5.0/rubygems/core_ext/kernel_require.rb:85:in
`require'
7: from /usr/lib/ruby/vendor_ruby/rubocop.rb:14:in `<top (required)>'
6: from
/usr/local/lib/site_ruby/2.5.0/rubygems/core_ext/kernel_require.rb:85:in
`require'
5: from
/usr/local/lib/site_ruby/2.5.0/rubygems/core_ext/kernel_require.rb:85:in
`require'
4: from /usr/lib/ruby/vendor_ruby/unicode/display_width.rb:2:in `<top
(required)>'
3: from /usr/lib/ruby/vendor_ruby/unicode/display_width.rb:2:in
`require_relative'
2: from /usr/lib/ruby/vendor_ruby/unicode/display_width/index.rb:3:in
`<top (required)>'
1: from /usr/lib/ruby/vendor_ruby/unicode/display_width/index.rb:4:in
`<module:Unicode>'
/usr/lib/ruby/vendor_ruby/unicode/display_width/index.rb:5:in
`<module:DisplayWidth>': undefined method `gunzip' for Gem:Module
(NoMethodError)
```
The exit code was 1.
This error appears to be related to [this
PR](https://github.com/janlelis/unicode-display_width/pull/15) where
`Gem.gunzip` was replaced with `Gem::Util.gunzip`.
The warnings at the beginning of the output seem related to [this
issue](https://github.com/rubygems/rubygems/issues/4702), though I don't
think they are of consequence for this bug (but they are annoying).
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: rubocop 0.52.1+dfsg-1
Uname: Linux 5.10.0-051000-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.27
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Fri Feb 4 12:57:53 2022
InstallationDate: Installed on 2021-01-04 (395 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
PackageArchitecture: all
SourcePackage: rubocop
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: rubocop (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug bionic
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https://bugs.launchpad.net/bugs/1960076
Title:
`rubocop --version` crashes on fresh ruby environment
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