# Zlib Error in ubuntu while installing new gems

**URL:** <https://www.ruby-forum.com/t/zlib-error-in-ubuntu-while-installing-new-gems/158194>\
**Category:** Ruby\
**Created:** [January 20, 2009, 11:39am UTC](https://www.ruby-forum.com/t/zlib-error-in-ubuntu-while-installing-new-gems/158194 "2009-01-20T11:39:07Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![arun](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/ee7513/32.png) [@arun](https://www.ruby-forum.com/u/arun)\
**Post date:** [January 20, 2009, 11:39am UTC](https://www.ruby-forum.com/t/zlib-error-in-ubuntu-while-installing-new-gems/158194/1 "2009-01-20T11:39:07Z")

</div>

Hi,

After installing the rubygems 1.3.1, I face the following issues while  
installing new gems.

Error:

arun@mysystem:~/Desktop$ sudo gem install ip2country-0.0.2.gem

ERROR: While executing gem … (Zlib::GzipFile::Error)  
not in gzip format

My Environment:

OS - ubuntu 8.04 - the Hardy Heron version.

Ruby - ruby 1.8.6 (2007-09-24 patchlevel 111) [i486-linux]

RubyGems Environment:

- RUBYGEMS VERSION: 1.3.1
- RUBY VERSION: 1.8.6 (2007-09-24 patchlevel 111) [i486-linux]
- INSTALLATION DIRECTORY: /usr/lib/ruby/gems/1.8
- RUBY EXECUTABLE: /usr/bin/ruby1.8
- EXECUTABLE DIRECTORY: /usr/bin
- RUBYGEMS PLATFORMS:
  - ruby
  - x86-linux

- GEM PATHS:
  - /usr/lib/ruby/gems/1.8
  - /home/arun/.gem/ruby/1.8

- GEM CONFIGURATION:
  - :update\_sources =\> true
  - :verbose =\> true
  - :benchmark =\> false
  - :backtrace =\> false
  - :bulk\_threshold =\> 1000

- REMOTE SOURCES:
  - [http://gems.rubyforge.org/](http://gems.rubyforge.org/)

Please suggest a solution. I want to install required gems. Do i need to  
revert my rubygems version? because in my older version rubygems-1.0.1,  
i dont see any errors. is it a bug in rubygems-1.3.1 or do i need to  
change anything?

Thanks,

Arun.

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<div class="post-metadata">

**Author:** ![arun](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/ee7513/32.png) [@arun](https://www.ruby-forum.com/u/arun)\
**Post date:** [January 21, 2009, 4:37pm UTC](https://www.ruby-forum.com/t/zlib-error-in-ubuntu-while-installing-new-gems/158194/2 "2009-01-21T16:37:04Z")

</div>

> arun@mysystem:~/Desktop$ sudo gem install ip2country-0.0.2.gem
> 
> ERROR: While executing gem … (Zlib::GzipFile::Error)  
> not in gzip format

did you apt-get install the ruby zlib libs?

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<div class="post-metadata">

**Author:** ![arun](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/ee7513/32.png) [@arun](https://www.ruby-forum.com/u/arun)\
**Post date:** [January 22, 2009, 5:57am UTC](https://www.ruby-forum.com/t/zlib-error-in-ubuntu-while-installing-new-gems/158194/3 "2009-01-22T05:57:32Z")

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Roger P. wrote:

> > arun@mysystem:~/Desktop$ sudo gem install ip2country-0.0.2.gem
> > 
> > ERROR: While executing gem … (Zlib::GzipFile::Error)  
> > not in gzip format
> 
> did you apt-get install the ruby zlib libs?

Yes I did, but still it throws the error. If i use rubygems-1.0.1, then  
i found no problems in installing gems. Its working well with  
rubygems-1.0.1.

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<div class="post-metadata">

**Author:** ![arun](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/ee7513/32.png) [@arun](https://www.ruby-forum.com/u/arun)\
**Post date:** [January 23, 2009, 5:26pm UTC](https://www.ruby-forum.com/t/zlib-error-in-ubuntu-while-installing-new-gems/158194/4 "2009-01-23T17:26:03Z")

</div>

Arunkumar B. wrote:

> Roger P. wrote:
> 
> > > arun@mysystem:~/Desktop$ sudo gem install ip2country-0.0.2.gem
> > > 
> > > ERROR: While executing gem … (Zlib::GzipFile::Error)  
> > > not in gzip format
> > 
> > did you apt-get install the ruby zlib libs?
> 
> Yes I did, but still it throws the error. If i use rubygems-1.0.1, then  
> i found no problems in installing gems. Its working well with  
> rubygems-1.0.1.

I’d try rebuilding all from scratch, or just stick with gems 1.0.1 🙂  
There may have been some difficulty from an upgrade from 1.0.1 to 1.3.1  
maybe it kept behind old cached [somehow bad] files?  
-=r