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rubygems package

Ruby gem command install does not find zlib

Asked by Tommy Pollák

After reinstallation of Ubuntu 12.04 and Ruby with rbenv the gem command install does not find zlib

~$ gem install rails
ERROR: Loading command: install (LoadError)
    cannot load such file -- zlib
ERROR: While executing gem ... (NameError)
    uninitialized constant Gem::Commands::InstallCommand
~$

This is a well known problem due to missing libs, so I have installed them (zlib1g-dev, zlib1g, libssl-dev,
      libreadline-gplv2-dev, lib64readline-gplv2-dev) with sudo apt-get, removed Ruby and reinstalled 1.9.3-p286 but it does not work still.

More info

~$ gem environment
RubyGems Environment:
  - RUBYGEMS VERSION: 1.8.23
  - RUBY VERSION: 1.9.3 (2012-10-12 patchlevel 286) [i686-linux]
  - INSTALLATION DIRECTORY: /home/user/.rbenv/versions/1.9.3-p286/lib/ruby/gems/1.9.1
  - RUBY EXECUTABLE: /home/user/.rbenv/versions/1.9.3-p286/bin/ruby
  - EXECUTABLE DIRECTORY: /home/user/.rbenv/versions/1.9.3-p286/bin
  - RUBYGEMS PLATFORMS:
    - ruby
    - x86-linux
  - GEM PATHS:
     - /home/user/.rbenv/versions/1.9.3-p286/lib/ruby/gems/1.9.1
     - /home/user/.gem/ruby/1.9.1
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :benchmark => false
     - :backtrace => false
     - :bulk_threshold => 1000
  - REMOTE SOURCES:
     - http://rubygems.org/
~$

~$ echo $PATH
/home/user/.rbenv/shims:/home/user/.rbenv/bin:/home/user/bin:/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
~$

So, what is wrong?

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Tommy Pollák
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Revision history for this message
actionparsnip (andrew-woodhead666) said : 		#1

What is the output of:

lsb_release -a; uname -a; dpkg -l | grep zlib

thanks

Revision history for this message
Tommy Pollák (tpollak) said : 		#2

~$ lsb_release -a; uname -a;dpkg -l | grep zlib
LSB Version: core-2.0-ia32:core-2.0-noarch:core-3.0-ia32:core-3.0-noarch:core-3.1-ia32:core-3.1-noarch:core-3.2-ia32:core-3.2-noarch:core-4.0-ia32:core-4.0-noarch
Distributor ID: Ubuntu
Description: Ubuntu 12.04.1 LTS
Release: 12.04
Codename: precise
Linux tpollak-XPS 3.2.0-32-generic-pae #51-Ubuntu SMP Wed Sep 26 21:54:23 UTC 2012 i686 i686 i386 GNU/Linux
ii zlib1g 1:1.2.3.4.dfsg-3ubuntu4 compression library - runtime
~$

OK?

Revision history for this message
Manfred Hampl (m-hampl) said : 		#3

Your output does not show zlib1g-dev !?!?!

Revision history for this message
Tommy Pollák (tpollak) said : 		#4

Thanks, you are right. So I installed:

~$ sudo apt-get install zlib1g-dev
[sudo] password for user:
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  linux-headers-3.2.0-29 linux-headers-3.2.0-29-generic-pae
Use 'apt-get autoremove' to remove them.
The following NEW packages will be installed:
  zlib1g-dev
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 162 kB of archives.
After this operation, 375 kB of additional disk space will be used.
Get:1 http://se.archive.ubuntu.com/ubuntu/ precise/main zlib1g-dev i386 1:1.2.3.4.dfsg-3ubuntu4 [162 kB]
Fetched 162 kB in 0s (729 kB/s)
Selecting previously unselected package zlib1g-dev.
(Reading database ... 181624 files and directories currently installed.)
Unpacking zlib1g-dev (from .../zlib1g-dev_1%3a1.2.3.4.dfsg-3ubuntu4_i386.deb) ...
Processing triggers for man-db ...
Setting up zlib1g-dev (1:1.2.3.4.dfsg-3ubuntu4) ...

but it did not help

~$ gem install Rails
ERROR: Loading command: install (LoadError)
    cannot load such file -- zlib
ERROR: While executing gem ... (NameError)
    uninitialized constant Gem::Commands::InstallCommand
~$

Is it necessary to remove Ruby and reinstall it again?

Revision history for this message
Tommy Pollák (tpollak) said : 		#5

Yes! After
rbenv uninstall 1.9.3-p286
rbenv install 1.9.3-p286

gem install rails

worked!