Permission denied @ rb_sysopen gem install pg on Ubuntu 16.04

Question

I have installed postgresql, libpq-dev and build-essential . When I ran gem install pg , I got a

ERROR:  Error installing pg:

ERROR: Failed to build gem native extension.

I tried every solution I found in stackoverflow, but none of them worked. However, now I ran gem install pg , I got a new error

ERROR:  While executing gem ... (Errno::EACCES)
    Permission denied @ rb_sysopen - /home/woyuxuxu123/.rvm/gems/ruby-2.3.3/gems/pg-0.21.0/.gemtest

Could anyone help me on this? I have been stuck on this for a whole afternoon.

Answer 1

在安装gem或在系统中进行更新之前，请使用sudo，如下所示： sudo apt update gem install pg