I'm trying to plan my new garden, and want to sketch it professionally - with dimensions of every element in it.
Is there an Ubuntu program for sketching house plans with vectorial elements, like those in the picture above?
I suggest SweetHome3D , it is in the repos.
Here is a screenshot, from its website:
There is a program called Librecad that may be what you are looking for.
To install LibreCad click the icon above or copy and paste the following command into Terminal
Then Press Enter, enter your password when prompted.