@lukas-w don't change your name :D

Per JENKINS-43977

"Just in case this helps someone else. The url in .gitmodules is case sensitive for the plugin. Running git in a command line is not case sensitive. This caused me some confusion since the git submodule update --init –recursive command would work from a command line, but I would get the following exception from the plugin. Once I changed the case in .gitmodules to match the case in the git repo the plugin worked."

.gitmodules

@@ -1,6 +1,6 @@
 [submodule "src/3rdparty/qt5-x11embed"]
 	path = src/3rdparty/qt5-x11embed
-	url = https://github.com/Lukas-W/qt5-x11embed.git
+	url = https://github.com/lukas-w/qt5-x11embed.git
 [submodule "src/3rdparty/rpmalloc/rpmalloc"]
 	path = src/3rdparty/rpmalloc/rpmalloc
 	url = https://github.com/rampantpixels/rpmalloc.git