This is happening on Windows 11. In the past, I worked with a dual installation.
When I opened the PC, the next step was to choose Ubuntu or Windows. At some stage, after installing a new distribution, a big bug happened and the process became to start on Ubuntu and the actual version was unsuitable. The only solution I found was to cancel the duality of the starting. Since I worked on Windows only.
But the old Linux stuff still takes up space and I want to free it.
I tried to look for it in the site but didn’t find a way to make it through the command line.