apt-get reporting wrong?

[H.S.Rai]

gem was working fine. I "apt-get autoremove" to remove un-used packages.

I found gem was not working. I tried to install, apt-get reports that
it is already installed. I removed it, installed it. But still "gem"
command is not found.

How I can install gem? See below signature for commands and response.

-- 
H.S.Rai

========================================

hsrai at gne:~$ sudo apt-get install  gem
Reading package lists... Done
Building dependency tree
Reading state information... Done
Suggested packages:
  pd-zexy
The following NEW packages will be installed:
  gem
0 upgraded, 1 newly installed, 0 to remove and 4 not upgraded.
Need to get 0B/2,587kB of archives.
After this operation, 6,779kB of additional disk space will be used.
Selecting previously deselected package gem.
(Reading database ... 203226 files and directories currently installed.)
Unpacking gem (from .../gem_1%3a0.92.2-2_i386.deb) ...
Processing triggers for doc-base ...
Processing 1 added doc-base file(s)...
Registering documents with scrollkeeper...
Processing triggers for man-db ...
Processing triggers for menu ...
Setting up gem (1:0.92.2-2) ...

Processing triggers for menu ...
hsrai at gne:~$ gem -v
-bash: gem: command not found
hsrai at gne:~$ sudo apt-get install  gem
Reading package lists... Done
Building dependency tree
Reading state information... Done
gem is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 4 not upgraded.
hsrai at gne:~$