With less than 10% free on an old SSD, I used
to find that one of the largest directories was for TeXlive documentation. It’s important to keep at least 10% of SSD space free to avoid excess wear. On HDD it’s also important to keep at least 10% free space to avoid excess fragmentation.
Using Synaptic, I highlighted everything using search term
This also removes
texlive-full but with no detriment to texlive working.