I believe this is fixed in cosmic now, after the ncurses transition that happened a few weeks ago.
In a cosmic container, I'm able to move the line in the htop screen with the mouse wheel, whereas in bionic nothing of the sort happens. And to confirm this further: bionic: $ ldd $(which htop)|grep ncurses libncursesw.so.5 => /lib/x86_64-linux-gnu/libncursesw.so.5 (0x00007efe6d7a5000) cosmic: $ ldd $(which htop)|grep ncurses libncursesw.so.6 => /lib/x86_64-linux-gnu/libncursesw.so.6 (0x00007fb763f36000) Closing the bug as "fix released" since it's available in Cosmic. ** Changed in: htop (Ubuntu) Status: New => Fix Released -- You received this bug notification because you are a member of Ubuntu Server, which is subscribed to htop in Ubuntu. https://bugs.launchpad.net/bugs/1730143 Title: no response to scroll wheel To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/htop/+bug/1730143/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs