ray@ray-Kudu-Pro:~$ sudo apt-get install -f
Reading package lists... Done
Building dependency tree       
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Setting up grub-pc (2.02~beta2-36ubuntu3.7) ...
/var/lib/dpkg/info/grub-pc.config: 36: /etc/default/grub: o: not found
dpkg: error processing package grub-pc (--configure):
 subprocess installed post-installation script returned error exit status 127
Errors were encountered while processing:
 grub-pc
E: Sub-process /usr/bin/dpkg returned an error code (1)