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I am following the instructions here to upgrade Ubuntu from 17.10 to 18.04. But when I run update-manager -d I get errors:

No protocol specified Unable to init server: Could not connect: Connection refused No protocol specified Unable to init server: Could not connect: Connection refused No protocol specified Unable to init server: Could not connect: Connection refused

(update-manager:7789): Gtk-WARNING **: cannot open display: :0

18.04 not available in Software Updater

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  • Are you running this from a terminal on your GUI? or are you logged into a Wayland session (as I recall it was the default in 17.10) as that command requires X11 to be used. You don't need the -d option as 18.04 has been released (-d or development-release is now 19.04 where you're a few steps behind). If using a terminal, upgrade first to latest 17.10 (sudo apt update && sudo apt dist-upgrade) then do-release-upgrade is a non-gui alternative.
    – guiverc
    Mar 16, 2019 at 21:34
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    Possible duplicate of Why don't gksu/gksudo or launching a graphical application with sudo work with Wayland? && askubuntu.com/q/91815/480481
    – pomsky
    Mar 18, 2019 at 5:58

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