When I remove proxy from System/Network and apply it system wide it still remains when working in console. When I run:

env | grep proxy

it prints:

http_proxy=http://proxy.studnet.lan:8080

ftp_proxy=ftp://proxy.studnet.lan:8080

socks_proxy=socks://proxy.studnet.lan:8080

https_proxy=https://proxy.studnet.lan:8080

I could remove it with:

unset http_proxy

unset ftp_proxy

unset socks_proxy

unset https_proxy

but it's not permanent, when I reopen terminal these proxy variables are again setted.

How to remove them permanently?