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and nope it still won't do it , i still get the the "gem command excist in ... "error after gem install bundler

ok so i went on and searched and found this :
https://steemit.com/radiator/@inertia/luckyluke-rb-voting-bot

followed the Linux setup :
Linux
$ sudo apt-get update
$ sudo apt-get install ruby-full git openssl libssl1.0.0 libssl-dev
$ sudo apt-get upgrade
$ gem install bundler

now when i run the "gem install bundler "i get the error :

ERROR: While executing gem ... (Gem::FilePermissionError)
You don't have write permissions for the /var/lib/gems/2.3.0 directory.

ubunt-oops-002.png

I was getting same error when I tried for first time, so used this https://stackoverflow.com/questions/37720892/you-dont-have-write-permissions-for-the-var-lib-gems-2-3-0-directory
Follow 1st answer by derek ,you will have to uninstall ruby and then reinstall

at your step 9 this is missing :
rbenv global 2.3.1
ruby -v

thanks ,edited, ruby -v command is just to check version number so don't really need that :)