git pull Your configuration specifies to merge with the ref ‘refs/heads/xxxx‘ from the remote, but n

Your configuration specifies to merge with the ref ‘refs/heads/xxxx’
from the remote, but no such ref was fetched.)

1.问题原因分析

1.主要是因为网页上仓库fork别人的，更新了就没了分支，但是本地还有
2.需要切换到丢失的分支下，需要先解锁：

git branch --unset-upstream

3.然后在执行git pull会有提示:

There is no tracking information for the current branch.
Please specify which branch you want to merge with.
See git-pull(1) for details.

    git pull <remote> <branch>

If you wish to set tracking information for this branch you can do so with:

    git branch --set-upstream-to=origin/<branch> xxx

2.问题解决

但是这样问题还不能根本性的解决:

git push -u origin "xxx"