Warning in system(full, intern = TRUE, ignore.stderr = quiet) :
  running command ''/usr/bin/git' ls-remote https://github.com/does/not/exist/404.git  2>/dev/null' had status 128
Warning in system(full, intern = TRUE, ignore.stderr = quiet) :
  running command ''/usr/bin/git' ls-remote https://github.com/does/not/exist/404.git  2>/dev/null' had status 128
Error: Failed to install 'unknown package' from Git:
  Command failed (128)
