Can confirm the issue on 19.04
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https://bugs.launchpad.net/bugs/1769677
Title:
gnome-software reads system proxy settings in a wrong way
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** Description changed:
After setting a proxy (e.g. http proxy) in Settings, gnome-software will
show a message saying something like
`E: https://mirrors.ustc.edu.cn/ubuntu bionic/universe amd64
libkf5archive5 amd64 5.44.0-0ubuntu1 is not (yet) available (Unsupported
proxy configured: