How to install a gem via user account?

I am logged in as user. I gave all root privileges to user. Now I am doing bundle install. It is breaking by saying "Make sure that gem install nokogiri before bundling. Now when I try to install by gem install nokogiri , it says permission denied. When I try it with sudo gem install nokogiri, then it says “sudo: gem: command not found”. How can I install this gem?

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This question was answered by @anishajayan:

swapon solved this issue. I followed this- “

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