"sudo gem uninstall -i /usr/share/rubygems-integration/all spring" fails due to "ERROR: While executing gem ... (Gem::FilePermissionError) You don't have write permissions for the /usr/share/rubygems-integration/all/bin directory."

[Karl-Philipp Richter]

`sudo gem uninstall -i /usr/share/rubygems-integration/all spring` fails due to

```
Remove executables:
 spring

in addition to the gem? [Yn] Y
ERROR: While executing gem ... (Gem::FilePermissionError)
    You don't have write permissions for the /usr/share/rubygems-integration/all/bin directory.
```

because `/usr/share/rubygems-integration/all/bin` doesn't exist, so the error message is misleading/wrong.

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: gem 1:0.93.3-10build3
ProcVersionSignature: Ubuntu 4.10.0-21.23-generic 4.10.11
Uname: Linux 4.10.0-21-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.4-0ubuntu4
Architecture: amd64
CurrentDesktop: Unity:Unity7
Date: Thu May 18 13:00:42 2017
InstallationDate: Installed on 2015-12-12 (522 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
SourcePackage: gem
UpgradeStatus: Upgraded to zesty on 2017-05-01 (16 days ago)

[dino99 (9d9)]

That version is now dead
http://news.softpedia.com/news/ubuntu-17-04-zesty-zapus-has-reached-end-of-life-upgrade-to-ubuntu-17-10-now-519360.shtml