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Unpacking python-dnspython (1.12.0-1) ...
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Unpacking samba (2:4.3.11+dfsg-0ubuntu0.16.04.13) ...
Selecting previously unselected package attr.
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Unpacking attr (1:2.4.47-2) ...
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Unpacking libaio1:amd64 (0.3.110-2) ...
Selecting previously unselected package samba-dsdb-modules.
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Processing triggers for man-db (2.7.5-1) ...
Processing triggers for libc-bin (2.23-0ubuntu10) ...
Processing triggers for ufw (0.35-0ubuntu2) ...
Processing triggers for systemd (229-4ubuntu21.2) ...
Processing triggers for ureadahead (0.100.0-19) ...
ureadahead will be reprofiled on next reboot
Setting up friendly-recovery (0.2.31ubuntu1) ...
Searching for GRUB installation directory ... found: /boot/grub
/etc/default/grub: line 20: ^G: command not found
dpkg: error processing package friendly-recovery (--configure):
 subprocess installed post-installation script returned error exit status 127