Can not use proxy to download packages on Ubuntu 20.04

Hi all,
I am a new user using RStudio on Linux.
I am also using RStudio on Windows for a long time and always using outbound proxy due to bad network connection in my university.
Now I found that RStudio on Linux could not use outbound proxy to download packages both in install.packages() and BiocManager::install() functions.

My settings are following this topic:
And yes, it works when I tried downloading packages on terminal but it was not working when I using RStudio which is quite slow and no traffic from my proxy.
Is there any other solutions or anything else I should set up for a Linux settings?

At last, thanks for forgiving my poor English!

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