No longer a problem in Ubuntu 21.04. In gnome settings go to "Applications", select Remmina and toggle "Inhibit system keyboard shortcuts". That gives the application permission to grab the keyboard.
** Changed in: remmina (Ubuntu) Status: Triaged => Invalid -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to remmina in Ubuntu. https://bugs.launchpad.net/bugs/1704870 Title: Keys can't be grabbed under Wayland Status in remmina: New Status in wayland: Confirmed Status in remmina package in Ubuntu: Invalid Status in wayland package in Fedora: Confirmed Bug description: Special keys are not working under Remmina. Seems to be a Wayland specification and implementation of that specification. This bug could embrace all apps that need this behavior (VirtualBox, vncviewer, etc) ProblemType: Bug DistroRelease: Ubuntu 17.10 Package: remmina 1.1.2-4ubuntu1 ProcVersionSignature: Ubuntu 4.11.0-10.15-generic 4.11.8 Uname: Linux 4.11.0-10-generic x86_64 ApportVersion: 2.20.5-0ubuntu5 Architecture: amd64 CurrentDesktop: GNOME Date: Mon Jul 17 15:36:36 2017 InstallationDate: Installed on 2017-07-04 (13 days ago) InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170626) SourcePackage: remmina UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/remmina/+bug/1704870/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp