Hmmm. /etc/shadow- is a backup; the previous version of the shadow file. The current shadow file should be there without the dash. If the shadow file (without the dash) is not there, you can use a copy of shadow- to replace it. While in the "etc" directory, type:
Then, use gedit as noted below to edit the file, removing the random-looking text between the two colons after the username. You don't have to make any changes to the passwd file. Save the file and reboot. You should be able to log in using the user name and no password. Once logged in, you can set a new password using the "passwd" command.