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Is there a way where i can fix these errors so that there won't a situation where these deleted workspaces cause any problems?
Try opening the file /home/lauran/.bashrc
in a text editor (gedit fi) and scroll to the end. Most likely you have a number of source /home/lauran/../devel/setup.bash
lines there.
Remove (or comment) those and save the file. Open a new terminal. The errors should now be gone.
I don't use these workspaces anymore but I've read that I should have deleted my workspaces more properly.
Workspaces are just directories with files, so removing them is exactly the same as you would with any other directories and / or files.
I wouldn't know of a more "proper way".