Plasma Keyboard doesn’t support modifier keys. And it is nearly impossible to use GNU/Linux on a touchscreen tablet (without keyboard), as you need these keys for terminal commands (also to select multiple things, or quickly copy/paste, or for terminal commands). There are tons of posts on this site about a usable on-screen-keyboard, but I could not find any solution.
I came across the abandoned vboard project, that looked promising.
I forked it, and added Plasma 6.6 compatibility, a tray icon, and many new features. I plan to maintain this for the foreseeable future.
Homepage: vboard | Virtual Keyboard for GNU/Linux Wayland Desktops
For Debian based distributions, a prebuilt .deb package is available on GitHub releases: Install it and reboot.
For Arch, I plan to publish this to AUR. But for now, you can install manually
yay -S vboard
Then, reboot.
For other distributions you can manually install from source: GitHub - archisman-panigrahi/vboard: Wayland compatible virtual keyboard with modifier keys for GNU/Linux · GitHub
Vboard uses uinput to send keystrokes, and it is also compatible with GNOME
Of course, this is not an ideal solution. Looking forward to Plasma Keyboard gaining modifier keys for a better native experience. Without it, I had been having real trouble using Plasma on my tablet, whereas Plasma on my desktop has been wonderful.


