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This error in the log reports the file is likely corrupted and so could not be unpacked and installed,

dpkg-deb (subprocess): decompressing archive member: lzma error: compressed data
 is corrupt

The md5 checksum of the file downloaded to your machine needs to match the MD5 sum column for the file as listed on the download page.  Check you see the output listed below before trying to install the .pkg file (and re-download if necessary).

- R.

$ md5sum  freesurfer_ubuntu20-7.3.2_amd64.deb

b2d0f8e6285f4a8da72d008a6390a7fe  freesurfer_ubuntu20-7.3.2_amd64.deb