Since I couldn't boot into the laptop's hard drive, I booted Trisquel from
the
USB-connected external hard drive, removed all the old linux files from /boot
in the external hard drives's operating system, then executed sudo
update-grub
followed by sudo grub-install /dev/sda. That restored my ability to boot into
the laptop's internal hard drive.
Why did this work? you might ask ... 'cuz grub is always in /dev/sda,
whichever
system I choose for bootup ... that's in the laptop's hard drive.
And now the grub menu is free of those pesky old linux-headers files, with
just
the last two pairs remaining, -3.13.0-139 & -3.13.0-141. Whew ... time for
dinner.
George Langford
