If you run this command and you should see results like this. Or do you now have multiple copies of 30_os-prober file?
Or did you install along side multiple times?
Code:
fred@Z170N:~$ ls -l /etc/grub.d/
total 80
-rwxr-xr-x 1 root root 9791 Jan 13 2017 00_header
-rwxr-xr-x 1 root root 6258 Mar 15 2016 05_debian_theme
-rwxr-xr-x 1 root root 12512 Mar 1 2017 10_linux
-rwxr-xr-x 1 root root 11082 Jan 13 2017 20_linux_xen
-rw-r--r-- 1 root root 3353 Mar 6 2017 25_custom
-rwxr-xr-x 1 root root 11692 Jan 13 2017 30_os-prober
-rwxr-xr-x 1 root root 1418 Jan 13 2017 30_uefi-firmware
-rwxr-xr-x 1 root root 1534 Nov 9 11:19 40_custom
-rwxr-xr-x 1 root root 216 Jan 13 2017 41_custom
-rw-r--r-- 1 root root 483 Jan 13 2017 README
Post this:
sudo parted -l
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