I have Ubuntu installed on VirtualBox and behind proxy. I have set automatic proxy configuration. All applications are able to connect to internet.
However Gnome Shell extensions are not getting installed. With Ubuntu Software center, it shows a timeout error though other applications are getting installed. From Browser on https://extensions.gnome.org, on-off button seems to do nothing (browser extension and chrome-gnome-shell are installed).
With manual proxy setting, Ubuntu Software center throws
Can someone help me to fix this?
sudo apt install <other apps> works without any error.