Re: Destroyed Entries at /dev/sda - boot not possible anymore

[Stefan Lamby]

> Andrei Borzenkov <address@hidden> hat am 31. März 2015 um 16:21 geschrieben:
>
>
> On Tue, Mar 31, 2015 at 4:17 PM, Stefan Lamby <address@hidden> wrote:
> >> > OK, so grub.cfg on /dev/sda1 refers to /dev/sdb2. Am I right that
> >> > /dev/sda1 is your original /boot?
> >
> > Yes, sda is the hd used originally.
> >
> ...
> >
> > address@hidden:~# mount -r /dev/sda2 /mnt
> > address@hidden:~# ls -l /mnt/
> > total 138250
> > -rw-r--r-- 1 root root 1207386 Jan 15 18:22 abi-3.16.0-30-generic
> > -rw-r--r-- 1 root root 1207327 Mar 10 21:12 abi-3.16.0-31-generic
> > -rw-r--r-- 1 root root 1207327 Mar 13 11:12 abi-3.16.0-33-generic
> > -rw-r--r-- 1 root root 171768 Jan 15 18:22 config-3.16.0-30-generic
> > -rw-r--r-- 1 root root 171802 Mar 10 21:12 config-3.16.0-31-generic
> > -rw-r--r-- 1 root root 171827 Mar 13 11:12 config-3.16.0-33-generic
> > drwxrwxr-x 2 root root 1024 Feb 21 18:27 efi
> > drwxr-xr-x 5 root root 1024 Mar 24 09:41 grub
> > -rw-r--r-- 1 root root 29216458 Feb 21 19:04 initrd.img-3.16.0-30-generic
> > -rw-r--r-- 1 root root 29225033 Mar 15 08:53 initrd.img-3.16.0-31-generic
> > -rw-r--r-- 1 root root 29232450 Mar 24 09:41 initrd.img-3.16.0-33-generic
> > drwx------ 2 root root 12288 Feb 21 18:27 lost+found
> > -rw-r--r-- 1 root root 176500 Mar 12 2014 memtest86+.bin
> > -rw-r--r-- 1 root root 178176 Mar 12 2014 memtest86+.elf
> > -rw-r--r-- 1 root root 178680 Mar 12 2014 memtest86+_multiboot.bin
> > -rw------- 1 root root 3511040 Jan 15 18:22 System.map-3.16.0-30-generic
> > -rw------- 1 root root 3511419 Mar 10 21:12 System.map-3.16.0-31-generic
> > -rw------- 1 root root 3512061 Mar 13 11:12 System.map-3.16.0-33-generic
> > -rw-r--r-- 1 root root 6345120 Feb 21 18:33 vmlinuz-3.16.0-30-generic
> > -rw-r--r-- 1 root root 6347032 Feb 19 16:18
> > vmlinuz-3.16.0-30-generic.efi.signed
> > -rw------- 1 root root 6346448 Mar 10 21:12 vmlinuz-3.16.0-31-generic
> > -rw------- 1 root root 6348376 Mar 15 08:53
> > vmlinuz-3.16.0-31-generic.efi.signed
> > -rw------- 1 root root 6348624 Mar 13 11:12 vmlinuz-3.16.0-33-generic
> > -rw------- 1 root root 6350552 Mar 24 09:41
> > vmlinuz-3.16.0-33-generic.efi.signed
> > address@hidden:~# ls -l /mnt/grub/
> > total 2381
> > drwxr-xr-x 2 root root 1024 Feb 21 18:40 fonts
> > -r--r--r-- 1 root root 9790 Mar 24 09:41 grub.cfg
> > -rw-rw-r-- 1 root root 1024 Mar 29 12:46 grubenv
> > drwxr-xr-x 2 root root 1024 Feb 21 18:40 locale
> > -rw-r--r-- 1 root root 2405285 Feb 21 18:40 unicode.pf2
> > drwxr-xr-x 2 root root 8192 Feb 21 18:40 x86_64-efi
> >
> > Yes, those partitions sda1,2,3 are the ones originally used. The ubuntu
> > installer
> > has overwritten sda even it was told to use sdb
>
> I do not know if it actually overwrote sda. Last change was apparently
> 24 March when new kernel 3.16.0-33 was installed. Did you update your
> "original" installation on this day?
>
> Rather it looks like second installation overwrote bootloader in
> /dev/sda1. So try following
>
> 1. boot into GRUB CLI with single disk, with USB
> 2. Execute
>
> insmod part_gpt
> insmod ext2
> chainloader (hd0,gpt2)/grub/x86_64-efi/core.efi
> boot
>
> With some luck you should get your original grub menu.
>

You made it, thank you so much! I was able to boot into my original installation.

 

Would you please guide me and help me with persisting it? When I reboot the machine I have to enter it all again at the grub cli.

How could that be archived?

 

Thank you.