Could this be a device dependent problem?
One of my installs on an old second hand laptop works fine with the newest
Trisquel updates. (I don't have access to any other hardware right now)
What kind of device are you using? Is it an X200, like bsharp1157? Does it
have libreboot installed?
Further, are any of your usual drives/partitions visible from the busybox
shell, using "ls /dev/sd*" ?
Are there any error messages? Do any errors get printed if you "exit" out of
the busybox shell?
Are you using disk encryption or LVM?
I'm asking because with additional information, it might be easier to see the
connection, expecially if more cases like this show up.