Ah, that makes sense. Sorry for my ignorance. I installed the qt5-default package and qhelpgenerator works as expected now.
qtchooser could use a more informative error message, though. I'm a pretty experienced programmer, and I didn't know what to make of "could not find a Qt installation of ''"; I can only imagine what a beginning user would think. Who maintains qtchooser? Is that you (Ubuntu)? I'd like to discuss this with them. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to qtchooser in Ubuntu. https://bugs.launchpad.net/bugs/1812150 Title: qhelpgenerator and qcollectiongenerator will not run Status in qtchooser package in Ubuntu: Invalid Bug description: I have qttols5-dev-tools installed, which provides a qthelpgenerator implementation. But when I try to run qhelpgenerator (or qcollectiongenerator) through their usual /usr/bin shims, it errors out: janke@ubuntu:~/local/repos/octave-addons-chrono/doc$ dpkg -S /usr/lib/x86_64-linux-gnu/qt5/bin/qhelpgenerator qttools5-dev-tools: /usr/lib/x86_64-linux-gnu/qt5/bin/qhelpgenerator janke@ubuntu:~/local/repos/octave-addons-chrono/doc$ ls -l /usr/lib/x86_64-linux-gnu/qt5/bin/qhelpgenerator lrwxrwxrwx 1 root root 31 Apr 14 2018 /usr/lib/x86_64-linux-gnu/qt5/bin/qhelpgenerator -> ../../../qt5/bin/qhelpgenerator janke@ubuntu:~/local/repos/octave-addons-chrono/doc$ which qhelpgenerator /usr/bin/qhelpgenerator janke@ubuntu:~/local/repos/octave-addons-chrono/doc$ ls -l /usr/bin/qhelpgenerator lrwxrwxrwx 1 root root 9 Dec 21 2017 /usr/bin/qhelpgenerator -> qtchooser janke@ubuntu:~/local/repos/octave-addons-chrono/doc$ qhelpgenerator -v qhelpgenerator: could not find a Qt installation of '' janke@ubuntu:~/local/repos/octave-addons-chrono/doc$ qcollectiongenerator -v qcollectiongenerator: could not find a Qt installation of '' janke@ubuntu:~/local/repos/octave-addons-chrono/doc$ Running them directly works: janke@ubuntu:~/local/repos/octave-addons-chrono/doc$ /usr/lib/x86_64-linux-gnu/qt5/bin/qhelpgenerator -v Qt Help Generator version 1.0 (Qt 5.9.5) janke@ubuntu:~/local/repos/octave-addons-chrono/doc$ /usr/lib/x86_64-linux-gnu/qt5/bin/qcollectiongenerator -v Qt Collection Generator version 1.0 (Qt 5.9.5) But most software will locate the /usr/bin shims instead of this actual binary. Looks like a problem with qtchooser? ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: qtchooser 64-ga1b6736-5 ProcVersionSignature: Ubuntu 4.15.0-29.31-generic 4.15.18 Uname: Linux 4.15.0-29-generic x86_64 ApportVersion: 2.20.9-0ubuntu7.2 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Wed Jan 16 20:00:43 2019 Dependencies: gcc-8-base 8.2.0-1ubuntu2~18.04 libc6 2.27-3ubuntu1 libgcc1 1:8.2.0-1ubuntu2~18.04 libstdc++6 8.2.0-1ubuntu2~18.04 InstallationDate: Installed on 2019-01-15 (1 days ago) InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725) ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: qtchooser UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qtchooser/+bug/1812150/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp