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

```