What is " Installation path :"
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Attempting to "link with Qt " I get this as Installation path default - in red
/home/qw/QtThat is NOT my latest "instillation path " not even close.
and no matter what I try using "browse" and real installation path - it stays red .
What Qt wants as "installation path"?
Obviously the syntax is wrong , so is the default.
Here is what file manager see as path

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Qt installation path is where the folder where
maintenancetoolis located - it is the path you provided when you have installed Qt using the online installer. -
Qt installation path is where the folder where
maintenancetoolis located - it is the path you provided when you have installed Qt using the online installer.qe@qe-desktop:~$ whereis maintenancetool
maintenancetool:???
second
when I did usual
sudo apt install qtcreatorit did not ask for where to install it, but I can find few "qtcreator" files .
third
at present, after clean install of ubuntu 21.04 I have NO "maintenance tool"
working on that onefourth
where is the phony default path ( in red) coming from ?ADDENDUM
Never mind - used real installer
https://www.qt.io/download-thank-you
and all is well