如何让linux系统使用rvm for ruby？
安装了rvm，但是命令行继续使用ruby的系统版本，然后一旦我删除它，它就会说找不到。

>     nolan@nolan-UX305LA:~/Downloads$ sudo dpkg -i ./shopify-cli-2.0.1.deb
>     (Reading database ... 251417 files and directories currently installed.)
>     Preparing to unpack ./shopify-cli-2.0.1.deb ...

>     /var/lib/dpkg/tmp.ci/preinst: 1: /var/lib/dpkg/tmp.ci/preinst: gem: not found
>     dpkg: error processing archive ./shopify-cli-2.0.1.deb (--install):
>     new shopify-cli package pre-installation script subprocess returned error exit status 127
>     Errors were encountered while processing: ./shopify-cli-2.0.1.deb

>     nolan@nolan-UX305LA:~/Downloads$ which ruby
>     /usr/share/rvm/rubies/ruby-3.0.0/bin/ruby

你可以看到上面的“gem:notfound”，但如果我输入“ruby-v”，我会得到。。。

> ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x86_64-linux]

这一切背后的原因是一揽子计划
shopify-cli-2.0.1.deb
需要ruby 2.6+而我只有2.5