Lenovo ideapad 710S-13IKB bios/boot issue

[Gabor Szabo]

Hi,

I have been fighting with this for several hours now and I feel pretty
lost. I don't even know how to describe it in short.

So I am describing all I have managed to find out in the hope that someone
will have some idea or suggestion.

I have a Lenovo ideapad on which I had Windows 10 and I think Ubuntu (about
8 month ago, so probably 18.10 or 19.04). As I recall I installed them dual
boot, but as it was not my computer only the Windows was used. The built-in
video camera did not work so today, following the instruction of the
automated hardware check of Lenovo I ran the BIOS upgrade program.

Since then I cannot boot the system, it does not even seem to recognize the
harddisk properly.

Before the flash I looked at the Boot section in the BIOS and as I recall
it had 3 interesting options
ubuntu
something Windows  (I don't recall the exact name)
ATA HDD: SAMSUNG ....
and a few about USD HDD/USE CD etc.

now when I enter the BIOS I don't see the one that had Windows in its name.
This seems like a problem :(

------------------------------------------------------------
If I set the "ATA HDD" as the first on the boot order I see  "System
bootloader not found"
and then it reboots automatically. It also seems to set the boot-order back
to

1. ubuntu
2. ATA HDD: SAMSUNG ....
...

When I boot now it automatically gets into the grub cli:

grub>

grub> ls
(hd0) (hd0,gpt5) (hd0,gpt4) (hd0,gpt3) (hd0,gpt2) (hd0,gpt1)

grub> ls (hd0)
Filesystem is unknown

same with all the others except
grub> ls (hd0,gpt2)
Filesystem is fat.

grub> ls (hd0,gpt2)/
efi/ System Volume Information/

This is the same as
grub> ls /

I have no idea what to do with this. I guess I need to find the /boot
somewhere, but so far I could not find it. Any ideas here?

---------------------------------------------------------------------
Booting from disk on key:
I found a disk on key with Ubuntu 18.10 on it.
After plugging in and changing the boot order in the BIOS I managed to boot
from it.
I could even connect to the wifi, but I don't know how to access the
harddisk of the computer.

sudo lsblk      shows me

NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
loop0    7:0    0   1.8G  1 loop /rofs
loop1    7:1    0  87.9M  1 loop /snap/core/5662
loop2    7:2    0 140.9M  1 loop /snap/gnome-3-26-1604/70
loop3    7:3    0   2.3M  1 loop /snap/gnome-calculator/238
loop4    7:4    0    13M  1 loop /snap/gnome-characters/124
loop5    7:5    0  14.5M  1 loop /snap/gnome-logs/45
loop6    7:6    0   3.7M  1 loop /snap/gnome-system-monitor/57
loop7    7:7    0  42.1M  1 loop /snap/gtk-common-themes/701
sda      8:0    1  14.3G  0 disk /cdrom
----sda1   8:1    1   1.9G  0 part
----sda2   8:2    1   2.4M  0 part

where sda is the disk on key.

At this point I was wondering how could I access the HD when running Ubuntu
from USB.

any pointers, ideas are welcome

Gabor
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