服务器要用ubuntu 系统，centos ssh链接时提示：
Warning: Permanently added '***' (ED25519) to the list of known hosts.
sign_and_send_pubkey: no mutual signature supported
Permission denied, please try again.
Permission denied, please try again.
***@***: Permission denied (publickey,password).
rsync: connection unexpectedly closed (0 bytes received so far) [sender]
rsync error: unexplained error (code 255) at io.c(231) [sender=3.2.7]