Question

after following the install instruction here on my Debian system

sudo apt-get install ruby1.9.1

I still get the error

root@MyDebianVPS:/usr/local# ruby
bash: ruby: command not found

should I restart my system to make it work or I miss something?

$ su root
Password: 
root@MyDebianVPS:/home/yozloy# sudo apt-get install ruby1.9.1
Reading package lists... Done
Building dependency tree       
Reading state information... Done
ruby1.9.1 is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 61 not upgraded.
root@MyDebianVPS:/home/yozloy# ruby -v
bash: ruby: command not found
root@MyDebianVPS:/home/yozloy# 

Answer 1

You are going to want to look to see if that is what the Debian package is actually called.

Try this:

sudo apt-get install ruby1.9

If that completes, awesome. Then try:

ruby -v

And report back what you have.