Comment 2 for bug 1720499

From DpkgTerminalLog.txt:
...
/usr/bin/ucf: line 567: awk: command not found
dpkg: error processing package unattended-upgrades (--configure):
 subprocess installed post-installation script returned error exit status 127

It looks like awk is missing from the system which either means that the filesystem is damaged or base-files is also missing which is an unsupported configuration.