The kdesudo failure was caused by these entries in /etc/sudoers: After this lines:
Defaults env_reset Defaults mail_badpass Defaults secure_path="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin" I had added these lines: # Allow proxy environment variables to pass through Defaults env_keep="no_proxy NO_PROXY" Defaults env_keep+="all_proxy ALL_PROXY" Defaults env_keep+="http_proxy HTTP_PROXY" Defaults env_keep+="https_proxy HTTPS_PROXY" Defaults env_keep+="ftp_proxy FTP_PROXY" After removing these lines kdesudo working again. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1435179 Title: kdesudo (vivid): Could not connect to display To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/kdesudo/+bug/1435179/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs