git gui - Linux

Hello,

I am trying to initialize remote git and push complete folder files
using git-gui. I'm Doing exactly the same sequence in windows with Git
Gui works perfectly.
But when doing remote->add in ubuntu, name: test Location: /home/ubuntu/test.git

I get the following error: fatal: GIT_WORK_TREE (or --work-tree=) not
allowed without specifying GIT_DIR (or --git-dir=) Should I set only
GIT_DIR=/home/ubuntu/test.git? And after doing that, repeat the
remote->add step giving the name and the same folder
/home/ubuntu/test.git again ?

Thanks, Ran