I don't know the password when using " ssh [email protected]" Instead , "sudo -i ~/.ssh/id_ubuntucore [email protected]",it worked.So what's the password? Ubuntu Core 22.
[Resolved]kernel Update issuse(CentOs7): When updated kernel from a old version, the network card driver need update too.
use "#lspci --nn | grep -i net" to check matched driver(http://elrepo.org/tiki/DeviceIDs)