当出现下面提示时

e list of known hosts.
Fetching: 100% (1167/1167), done in 44.619s
info: A new version of repo is available
warning: repo is not tracking a remote branch, so it will not receive updates
================================================================================
Repo command failed: RepoUnhandledExceptionError
        GitCommandError: 'reset --keep v2.46^0' on repo failed
stderr: error: Entry 'git_command.py' not uptodate. Cannot merge.
fatal: Could not reset index file to revision 'v2.46^0'.

解决方案是 

cd .repo/repo

之后执行 git pull

同步最新 repo 之后

再次repo sync -j43  即可正常

之后正常