In case anyone else is stuck with this: it just means the write permissions are wrong in the repo that you’re pushing to. Go and `chmod -R` it so that the user you’re accessing the git server with has write access.
$ git push vps Counting objects: 47, done. Compressing objects: 100% (34/34), done. Writing objects: 100% (34/34), 5.72 KiB, done. Total 34 (delta 24), reused 0 (delta 0) error: unable to write sha1 filename ./objects/74/f54987f7c49320a3c487822d291 19a6477c: Permission denied fatal: failed to write object error: unpack failed: unpacker exited with error code To ssh://firstname.lastname@example.org:/home/git/todoapp.git ! [remote rejected] groups -> groups (n/a (unpacker error)) ! [remote rejected] master -> master (n/a (unpacker error)) error: failed to push some refs to 'ssh://email@example.com:/home/git/todoapp.git'