I have a Dell laptop with a 120GB SSD hard disk. It has Ubuntu 18.04 LTS installed on a single partition on the main drive.
Whilst trying to make a USB boot disk from the command line, I accidentally did a umount /dev/sda1 or /dev/sda (can recall). Shortly after the machine spewed some log errors and hung.
When I boot the machine, I've taken to the grub rescue prompt, which displays "error: unknown filesystem. Entering rescue mode...".
Using a friend's computer, I created an Ubuntu 18.04 LTS usb live pen. From the "try without installing" option, I was able to get access to Wifi and install boot-repair tool. (see output below, with paste bin link at the bottom).
It appears that Grub sees the file system incorrectly as iso9660. When I installed Ubuntu using the GUI installed, I chose the default options (so I'm not sure whether it should be ext2, ext3 or ext4).
Either way, it's most certainly not iso9660. How do I repair the Grub configuration so that I can boot from the hard disk please?
Update: I have since tried booting to the ubuntu USB drive and manually mounting the /dev/sda1 120GB SSD. It is in fact a iso9660 fstype containing the Ubuntu installer, so it would appear I dd copied over my OS with the 1.89GB installer image.
I've obviously lost the first ~2GB of data, but is there a way to recover the rest of the file system?
File system: iso9660
Boot sector type: Unknown
Boot sector info:
Boot files: /boot/grub/grub.cfg
Drive: sda _____________________________________________________________________ Disk /dev/sda: 119.2 GiB, 128035676160 bytes, 250069680 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: dos Partition Boot Start Sector End Sector # of Sectors Id System /dev/sda1 * 2,048 250,068,991 250,066,944 83 Linux Device UUID TYPE LABEL /dev/loop0 squashfs /dev/loop1 squashfs /dev/loop2 squashfs /dev/loop3 squashfs /dev/loop4 squashfs /dev/loop5 squashfs /dev/loop6 squashfs /dev/loop7 squashfs /dev/sda1 2018-07-25-03-21-56-00 iso9660 Ubuntu 18.04.1 LTS amd64 /dev/sdb1 B1DB-1D1B vfat UNTITLED