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...was empty. Finally, thanks to all the advice received in this thread, I could fix the problem by editing the 'sudoers' file, and making the environment variables related to the proxy (http_proxy, https_proxy, ftp_proxy) were preserved for the sudo account, as described here: http://blog.troyastle.com/2009/11/proxy-environment-variables-and-sudo-in.html using 'gedit' instead of 'visudo', as described here: http://bapoumba.wordpress.com/2008/05/07/edit-etcsudoers-with-gedit-in-ubuntu-hardy-heron/ I put the 'R-sig-Debian' list in cc just in case this may be useful f...