When I right click the hp tray icon and click on "HP Device Manager" nothing
happens. Running the hp-toolbox command on the terminal opens the Hp device
manager normally.

It seems that this only happens when the tray icon is created when hp-toolbox
runs without a tray icon already there.

This bug was filed for a very old version of hplip and probably has been fixed in a later upload.  So I am manually closing this bug now.

In case this bug is still present in the latest version of hplip, please reopen the bug.

Unfortunately HP is no longer willing to maintain this software properly and does not even provide a public bug tracker. Meanwhile the Ubuntu Launchpad tracker is ignored as well.
Therefore it is very unlikely that HP becomes aware of this bug and will fix it.

So if you reopen this bug and really want to have this fixed, please also provide a patch.

    Thorsten