Questions[busybox](ubuntu)

Computer specs:
Model: Dell XPS15 9550
Processor: Intel i7-6700HQ
GPU: NVIDIA GeForce GTX 960M
RAM: 16GB
Storage: 1TB SSD
Dual boot Ubuntu 18.04/Windows 10

After replacing the motherboard of the computer, the BIOS configuration was set to default and the Ubuntu partition was undetected. Windows partition remained intact and healthy. Following I made these changes to the BIOS in order to reestablish the partition:
-Disabled Secure Boot.
-In Boot List Option (set to UEFI), added a Boot Option Ubuntu with Filename: /EFI/ubunt/shimx64.efi

With those configurations I got the following error during boot:

ACPI Error: Method parse/execution failed \_T2.FN04._ON, AE_NOT_F  
acpi PHPOCOB:04: Failed to set initial power state  
ACPI Error: [\_SB_.PCIO.LPCB.H_EC.EC.ECAV] Namespace lookup failure,  
ACPI Error: Method parse/execution failed \_T2.FN04._ON, AE_NOT_  
ACPI Error: [\_SB_.PCIO.LPCB.H_EC.EC.ECAV] Namespace lookup failure,  
ACPI Error: Method parse/execution failed \_T2.FN04._ON, AE_NOT_  
ACPI Error: [\_SB_.PCIO.LPCB.H_EC.EC.ECAV] Namespace lookup failure,  
ACPI Error: Method parse/execution failed \_T2.FN04._ON, AE_NOT_  
ACPI Error: [\_SB_.PCIO.LPCB.H_EC.EC.ECAV] Namespace lookup failure,  
ACPI Error: Method parse/execution failed \_T2.FN04._ON, AE_NOT_  
Couldn't get size: 0x800000000000000e  







PKCS#7 signature not signed with a trusted key  
PKCS#7 signature not signed with a trusted key  
PKCS#7 signature not signed with a trusted key  

After that I am prompted to a Busy Box v1.27.2 (ubuntu) built-in shell (ash)
(initramfs)

Please advise on how to get my partition back up. From the Windows partition I can see that the partition is "healthy" I also tried by configuring the BIOS SATA Operation" from "RAID On" to "AHCI", but I get a blue error screen instead.

I try to setup a most minimal chrooted environment using busybox.
I created a directory 'testRoot' and copied 'busybox' into it.

from this directory I execute:

sudo chroot ./ /busybox sh

now I have an interactive environment. commands like 'ls' and 'pwd' work:

BusyBox v1.27.2 (Ubuntu 1:1.27.2-2ubuntu3.2) built-in shell (ash)
Enter 'help' for a list of built-in commands.
/ # ls
busybox  testje
/ # pwd
/
/ # 

some others (like 'vi') doesn't:

/ # vi
sh: vi: not found

on the otherhand starting vi outside the interactive shell works:

sudo chroot ./ /busybox vi

and outside the chrooted environment in the interactive shell there is also no problem:

eldendo@eldendo-WIM2140:~/testRoot$ busybox sh
BusyBox v1.27.2 (Ubuntu 1:1.27.2-2ubuntu3.2) built-in shell (ash)
Enter 'help' for a list of built-in commands.
~/testRoot $ vi (--- vi starts up here ---)
~/testRoot $ 

Any idea's ?

I'm trying to watch dmesg output in (initramfs) but command output has more lines than a screen. So I see only the end of dmesg output. Busybox v1.21.1 has more command, but dmesg | more somehow doesn't work as expected (it shows complete output without possibility scroll).

Why it doesn't work and are there any other ways in initramfs to watch dmesg output?

I have ubuntu 16.04 installed.. whenever I boot the system and try to run ubuntu, busy box pops up. I do a manual check ---fsck -yf /dev/sda12--- and then reboot.. now the ubuntu boots properly but then after few minutes i am not able to save/write anything on ubuntu(says the the disk is read only) nor can i open my other partitions which i was able to access few minutes ago. I again restart my system and the same busybox appears. The cycle goes on and on. What should i do.. is my hard drive completely corrupted?

I've installed win 7 and ubuntu 11.04. I was trying to upgrade my machine to 11.10.

It was all good, it installed all the upgrades and asked me to restart.

After restarting I got the login screen only once. After that there was just a blank screen. So I manually restarted it.

Now whenever I tried to restart, I get the

Busybox v1.18.4 (Ubuntu 1:1.18.4-2ubuntu2) built-in shell(ash)
Enter help for a list of built-in commands. 

(initramfs)

Here's what happens when i boot:

• Bios loads

• Grub displays option to load:

  ubuntu with Linux 3.0.0-19-generic
  ubuntu with Linux 3.0.0-19-generic (recovery mode)
  Previous versions Linux
  memtest
  another memtest option
  win7 (loader) (on /dev/sda2)
  

I am able to log in to the Windows 7 though.

If I log on to the previous linux versions also I am ending up at the same error.

Things I have tried:

1. When I type exec startx it gives the following error:

   /bin/sh : exec: line 0: startx: not found
   
   [ 123.764413] kernel panic - not syncing : Attempted to kill init!
   [ 123.764441] Pid : 1, comm : init not tainted 3.0.0-19 generic #33-Ubuntu
   [ 123.764466] call Trace :
   

   and a bunch of commands

   The caps Lock but is blinking right now at this stage. I need to manually shut it down.

2. Tried to log in to the recovery mode

   It gives the error : a bunch of errors (Please let me know if I need to list them. ) Then the last error is No init found. Try passing init=bootarg.

Then I am stuck at the busybox error and the busybox initramfs prompt.

1. Tried to log in to the Previous Linux versions, but get the same busybox initramfs prompt.

sudo fdisk -l
Disk /dev/sda: 750.2 GB, 750156374016 bytes
255 heads, 63 sectors/track, 91201 cylinders, total 1465149168 sectors

Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0xf5cd5cce
   Device Boot      Start         End      Blocks   Id  System
/dev/sda1            2048      206847      102400   de  Dell Utility
/dev/sda2   *      206848    30926847    15360000    7  HPFS/NTFS/exFAT
/dev/sda3        30926848   953147119   461110136    7  HPFS/NTFS/exFAT
/dev/sda4       953149438  1465145343   255997953    f  W95 Ext'd (LBA)
Partition 4 does not start on physical sector boundary.
/dev/sda5       953149440  1239869439   143360000    7  HPFS/NTFS/exFAT
/dev/sda6      1362751488  1465145343    51196928    7  HPFS/NTFS/exFAT
/dev/sda7      1239871488  1346158591    53143552   83  Linux
/dev/sda8      1346160640  1362745343     8292352   82  Linux swap / Solaris
Partition table entries are not in disk order

sudo sfdisk -uS -l /dev/sda
Disk /dev/sda: 91201 cylinders, 255 heads, 63 sectors/track
Warning: extended partition does not start at a cylinder boundary.
DOS and Linux will interpret the contents differently.
Units = sectors of 512 bytes, counting from 0
   Device Boot    Start       End   #sectors  Id  System
/dev/sda1          2048    206847     204800  de  Dell Utility
/dev/sda2   *    206848  30926847   30720000   7  HPFS/NTFS/exFAT
/dev/sda3      30926848 953147119  922220272   7  HPFS/NTFS/exFAT
/dev/sda4     953149438 1465145343  511995906   f  W95 Ext'd (LBA)
/dev/sda5     953149440 1239869439  286720000   7  HPFS/NTFS/exFAT
/dev/sda6     1362751488 1465145343  102393856   7  HPFS/NTFS/exFAT
/dev/sda7     1239871488 1346158591  106287104  83  Linux
/dev/sda8     1346160640 1362745343   16584704  82  Linux swap / Solaris