Try exporting the https_proxy environment variable in addition to http_proxy (without "s"). I found that suggestion in https://bugs.launchpad.net/ubuntu/+source/software-properties/+bug/516032 and it works fine for me:
export http_proxy=... export https_proxy=... add-apt-repository ppa:...
Try exporting the https_proxy environment variable in addition to http_proxy (without "s"). I found that suggestion in https:/ /bugs.launchpad .net/ubuntu/ +source/ software- properties/ +bug/516032 and it works fine for me:
export http_proxy=...
export https_proxy=...
add-apt-repository ppa:...