Currently running Kubuntu 16.04. After a recent update, Yakuake stopped showing up, even though the notification that it is running still showed up. I installed Guake and Tilda, and neither of those show up.
The problem is not restricted to a single user (still happened with a new user), however, it is restricted to the Plasma desktop. I installed Gnome and Yakuake (and Guake) does show up.

I gave up, and tried a system reinstall from an old LiveCD for Kubuntu 16.04.1, and I kept my /home partition. After the full system reinstall, yakuake was working properly again. But after I updated all the packages and rebooted, the problem showed up again. I tried updating to Plasma 5.13, but again, no solution (however, Plasma 5.13 is absolutely gorgeous).

Kwin does create the window. If I enable "Show Paint" in the Desktop effects and try to call Yakuake, I can see that Kwin does update the area where Yakuake could be. It seems that Yakuake is functional, since blind-running commands with long output (e.g. ls -lah) again shows that the window updates.

If I run yakuake from the terminal, there are no errors when I try to call it.

At this point, I'm totally stuck, and I don't know what to do.

I have the same issue, I know yakuake works because at work (laptop) I can open it on both external monitors, but on the laptop screen it does not show up. However I know the app opens as I have to toggle it again to close it before I can open it on one of the monitors that work. Laptop is kubuntu 18.10

At home I have the same issue on my stationary machine, except that it will only be visible on 1 of the monitors, home is 18.04 with kubuntu backports.

Versions on the laptop:

Code: Select all

No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 18.10
Release:        18.10
Codename:       cosmic

Code: Select all

$ apt list --installed plasma*
Listing... Done
plasma-browser-integration/cosmic,now 5.13.5-1ubuntu1 amd64 [installed,automatic]
plasma-dataengines-addons/cosmic,now 4:5.13.5-1ubuntu1 amd64 [installed,automatic]
plasma-desktop-data/cosmic,cosmic,now 4:5.13.5-1ubuntu4 all [installed,automatic]
plasma-desktop/cosmic,now 4:5.13.5-1ubuntu4 amd64 [installed,automatic]
plasma-discover-common/cosmic-updates,cosmic-updates,now 5.13.5-1ubuntu6.1 all [installed,automatic]
plasma-discover-flatpak-backend/cosmic-updates,now 5.13.5-1ubuntu6.1 amd64 [installed]
plasma-discover-snap-backend/cosmic-updates,now 5.13.5-1ubuntu6.1 amd64 [installed,automatic]
plasma-discover/cosmic-updates,now 5.13.5-1ubuntu6.1 amd64 [installed,automatic]
plasma-framework/cosmic,now 5.50.0-0ubuntu1 amd64 [installed,automatic]
plasma-integration/cosmic,now 5.13.5-1ubuntu1 amd64 [installed,automatic]
plasma-nm/cosmic,now 4:5.13.5-1ubuntu1 amd64 [installed,automatic]
plasma-pa/cosmic,now 4:5.13.5-0ubuntu2 amd64 [installed,automatic]
plasma-runners-addons/cosmic,now 4:5.13.5-1ubuntu1 amd64 [installed,automatic]
plasma-scriptengine-javascript/cosmic,now 4:17.08.3-0ubuntu2 amd64 [installed,automatic]
plasma-vault/cosmic,now 5.13.5-1ubuntu1 amd64 [installed,automatic]
plasma-wallpapers-addons/cosmic,now 4:5.13.5-1ubuntu1 amd64 [installed,automatic]
plasma-widgets-addons/cosmic,now 4:5.13.5-1ubuntu1 amd64 [installed,automatic]
plasma-workspace/cosmic,now 4:5.13.5-1ubuntu1 amd64 [installed,automatic]