Cmake Error: Problem with archive_write_finish_entry(): Write to restore size failed

I’m getting this error when building CMake;

... {more warnings, all unkown}
cmake -E tar: warning: unknown warning
cmake -E tar: warning: unknown warning
cmake -E tar: warning: unknown warning
CMake Error: Problem with archive_write_finish_entry(): Write to restore size failed
CMake Error: Problem extracting tar: /mnt/c/inav/downloads/gcc-arm-none-eabi-9-2020-q2-update-x86_64-linux.tar.bz2
CMake Error at cmake/arm-none-eabi-checks.cmake:84 (message):
  error extracting gcc-arm-none-eabi-9-2020-q2-update-x86_64-linux.tar.bz2: 1
Call Stack (most recent call first):
  cmake/arm-none-eabi-checks.cmake:107 (arm_none_eabi_gcc_install)
  cmake/arm-none-eabi-checks.cmake:119 (arm_none_eabi_gcc_check)
  CMakeLists.txt:37 (include)


-- Configuring incomplete, errors occurred!

Completely new to anything command line related, and have gotten this error following a step-by-step instruction on multiple computers. I am running Ubuntu 20.04 on a Linux subsystem on Windows. I have seen similar problems posted on stack exchange, but never this exact error, so I’m wondering if I did something really stupid that is preventing me from building CMake.

Please don’t with-hold any suggestions because they seem too obvious- I am completely new to this and haven’t tried any troubleshooting. OR if you know where to unzip this file, could I just do it manually?