I installed a package in Linux that let me edit some options in grub, for example change the boot order. When I applied these changes it somehow broke grub and now I just get to the command line) . Of course I should be able to restore grub and get it like it was before via the command line? I have googled and searched and found commands but no command seem to work, they are all unknown. I also downloaded and made a bootable USB with super grub disc but that does not work either.
What package did you install?
best thing to do. Boot up that USB. open a console.
list your partitions fdisk -l
assuming its a standard install you'll have at least 2 partitions, a root partition and boot partition. they will be listed something like /dev/sda1 /dev/sda2 etc.
Figure out whats what. the OS partition is usually the largest, the boot partition is usually the smallest (but not EFI if thats listed too). For this example ill use sda2 as / and sda1 as /boot
mount your root (OS) partition and boot partition then chroot into them
mount /dev/sda2 /mnt
mount /dev/sda1 /mnt/boot
chroot /mntBackup and then Then fix grub
cp /boot/grub/grub.cfg /boot/grub/grub.cfg.backup
grub2-mkconfig -o > /boot/grub/grub.cfgunload and reboot
exit
umount /mnt/boot
umount /mnt
rebootKeep in mind.
You've not given us much info. Your OS might have grub1-mkconfig as grub-mkconfig. You haven't said what the program was or what it changed. If it changed /etc/default/grub then this wont work, you'll need to edit /etc/default/grub back to its normal settings and run the grub2-mkconfig command as above again.
Here is an example output of fdisk. You can see you can make assumptions from the sizes. EFI is the EFI partition, 500M is very small its the boot partition, 457G is obviously the main root partition, and 7.3G is the swap (the same amount as my ram)
[root@jupiter eden]# fdisk -l
Disk /dev/sda: 465.8 GiB, 500107862016 bytes, 976773168 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: gpt
Disk identifier: EE69EE85-9C91-4B46-BB0D-6EF0F7C5388E
Device Start End Sectors Size Type
/dev/sda1 2048 411647 409600 200M EFI System
/dev/sda2 411648 1435647 1024000 500M Linux filesystem
/dev/sda3 1435648 961564671 960129024 457.8G Linux filesystem
/dev/sda4 961564672 976769023 15204352 7.3G Linux filesystem
Disk /dev/sdb: 111.8 GiB, 120034123776 bytes, 234441648 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
Disk identifier: 0x0aefedb6Yes I\m sorry, I\m in a bit of hurry, I\m writing this from a live usb and my keyboard settings are all wrong to, making it very tideous to type in commands, I will try this and report back. The package I used was grub-customizer, http://www.howtogeek.com/howto/43471/how-to-configure-the-linux-grub2-boot-menu-the-easy-way/
First I changed the boot order, and that worked fine. Then I rebooted and changed the timeout for grub to boot by itself. When I changed it from 10 second to 3 this happend.
EDIT:
On the live USB I installed the same package and restored settings, seem to have solved the problem. A big thanks anyways! Worried I'd had to reformat my harddrive.