All freebsd version
pkg install mysql55-server
2) ERROR I HAVE CHECK UP ALL VERSION :(
Do you want to fetch and install it now? [y/N]: y
Bootstrapping pkg from pkg+http://pkg.FreeBSD.org/FreeBSD:xx:xx/quarterly, please wait...
pkg: Error fetching http://pkg.FreeBSD.org/FreeBSD:10:i386/quarterly/Latest/pkg.txz: Not Found
A pre-built version of pkg could not be found for your system.
Consider changing PACKAGESITE or installing it from ports: 'ports-mgmt/pkg'.
AND IN HOST AGAIN PROBLEM
This is the first time this has happened
This has never happened to me before
FreeBSD 10 is no longer supported. This is probably the reason your download failed.
Please, upgrade to a supported FreeBSD version: https://www.freebsd.org/security/#sup
You will benefit from security updates and fixes that are not present in 10, along with improvements in performance, stability, etc.