Grub Loading. Error: No such disk

[bcbc]

I haven't done it myself but I believe this is how:

sudo mount /dev/sdc5 /mnt
sudo grub-install --root-directory=/mnt/ /dev/sda

1st command mounts your ubuntu system
2nd installs grub2 to mbr on sda

[djm227]

Ok, it feels like we're getting a little bit closer.

Here's what I got after the first command (which I assume worked fine):

ubuntu@ubuntu:~$ sudo mount /dev/sdc5 /mnt ext4
Usage: mount -V                 : print version
       mount -h                 : print this help
       mount                    : list mounted filesystems
       mount -l                 : idem, including volume labels
So far the informational part. Next the mounting.
The command is `mount [-t fstype] something somewhere'.
Details found in /etc/fstab may be omitted.
       mount -a [-t|-O] ...     : mount all stuff from /etc/fstab
       mount device             : mount device at the known place
       mount directory          : mount known device here
       mount -t type dev dir    : ordinary mount command
Note that one does not really mount a device, one mounts
a filesystem (of the given type) found on the device.
One can also mount an already visible directory tree elsewhere:
       mount --bind olddir newdir
or move a subtree:
       mount --move olddir newdir
One can change the type of mount containing the directory dir:
       mount --make-shared dir
       mount --make-slave dir
       mount --make-private dir
       mount --make-unbindable dir
One can change the type of all the mounts in a mount subtree
containing the directory dir:
       mount --make-rshared dir
       mount --make-rslave dir
       mount --make-rprivate dir
       mount --make-runbindable dir
A device can be given by name, say /dev/hda1 or /dev/cdrom,
or by label, using  -L label  or by uuid, using  -U uuid .
Other options: [-nfFrsvw] [-o options] [-p passwdfd].
For many more details, say  man 8 mount .

Here's what it said after the second command, which is where I believe the problems lie:

ubuntu@ubuntu:~$ sudo grub-install --root-directory=/mnt/ /dev/sda
grub-probe: error: cannot find a device for /mnt//boot/grub.

No path or device is specified.
Try ``grub-probe --help'' for more information.
Auto-detection of a filesystem module failed.
Please specify the module with the option `--modules' explicitly.
ubuntu@ubuntu:~$

[bcbc]

Ok, it feels like we're getting a little bit closer.

Here's what I got after the first command (which I assume worked fine):

ubuntu@ubuntu:~$ sudo mount /dev/sdc5 /mnt ext4

Try both commands again, but leave off the "ext4" on the end of the 1st.

[djm227]

Prior to running the two commands, if I left the filesystem (ext4) off of the first string, I would get:
mount: you must specify the filesystem type
Now if I do it without the ext4 I get:

mount: /dev/sdc already mounted or /mnt busy

Then I get the same thing I did before after running the second command:

ubuntu@ubuntu:~$ sudo grub-install --root-directory=/mnt/ /dev/sda
grub-probe: error: cannot find a device for /mnt//boot/grub.

No path or device is specified.
Try ``grub-probe --help'' for more information.
Auto-detection of a filesystem module failed.
Please specify the module with the option `--modules' explicitly.
ubuntu@ubuntu:~$ grub-probe --help
Usage: grub-probe [OPTION]... [PATH|DEVICE]

Probe device information for a given path (or device, if the -d option is given).

  -d, --device              given argument is a system device, not a path
  -m, --device-map=FILE     use FILE as the device map [default=/boot/grub/device.map]
  -t, --target=(fs|fs_uuid|drive|device|partmap|abstraction)
                            print filesystem module, GRUB drive, system device, partition map module or abstraction module [default=fs]
  -h, --help                display this message and exit
  -V, --version             print version information and exit
  -v, --verbose             print verbose messages

Report bugs to <bug-grub@gnu.org>.
ubuntu@ubuntu:~$

[bcbc]

Just unmount it first and try again. The reason it failed the first time is you didn't specify the partition: you typed "sudo mount /dev/sda /mnt".

[djm227]

you, sir, are a genius.

[Miljet]

The mount command keeps telling you that you must specify the partition type like this:

ubuntu@ubuntu:~$ sudo mount -t ext4 /dev/sdc5 /mnt

[bcbc]

Glad it all worked out