Change /etc/ntp.conf to put the driftfile in /var/lib/ntp on Linux.
What I thought was the LCD for all OSes, /etc/ntp.drift, doesn't work because ntpd does not run as root and it wants to create a tmp file for the new drift value in the same dir as the driftfile. So if /var/lib/ntp exists in the image, we modify /etc/ntp.conf to put the driftfile there. The ntpstart and watchdog scripts should pick this up just fine as is.
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