I was trying to repair my GRUB after installing Windows over Ubuntu . But i couldn't repair it and asked this question. While discussing with psusi , we notice something. My installed system is 64Bit but my some library files' are 32 bit (for example : libdevmapper.so.1.02.1).

(You can check step 13 for my question. And check other steps for see which steps i followed.)

1. My old Ubuntu was installed on /dev/sda3 . I mounted it to /mnt/ubusda3


2. root@ubuntu:/home/ubuntu# file /mnt/ubusda3/sbin/init
/mnt/ubusda3/sbin/init: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.15, stripped


3. root@ubuntu:/home/ubuntu# file /mnt/ubusda3/lib/libdevmapper.so.1.02.1
/mnt/ubusda3/lib/libdevmapper.so.1.02.1: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped


4. sudo dpkg --root=/mnt/ubusda3 -i /mnt/ubusda3/var/cache/apt/archives/libbz2-1.0_1.0.5-6ubuntu1.11.10.1_amd64.deb


5. chroot /mnt/ubusda3


6. apt-get install --reinstall libdevmapper1.02.1


7. And then again i tried to update-grub i got mapdevfs: error while loading shared libraries: libdebian-installer.so.4: cannot open shared object file: No such file or directoryerror.


8. I restarted my system but nothing changed.


9. i found mapdevfs on /bin/mapdevfswith which mapdevfs command.


10. sudo rm /bin/mapdevfs


11. for i in /sys /proc /run /dev; do sudo mount --bind "$i" "/mnt/ubusda3$i"; done


12. grub-install /dev/sda


13. Finally i fix my GRUB problem. Now there is a GRUB menu while booting.
    
    Previous Linux Versions screen (and dusts)
    

But when i choose Ubuntu 3.0.0.17-generic, it's freezing on loading screen and i'm getting this error :
(Scroll Lock and Num Lock flashing.)

When i choose other kernel versions -which in previous ubuntu versions screen- , i'm getting this error for both of them.

Note 1 (for irrational John)

ubuntu@ubuntu:~$ sudo su

root@ubuntu:/home/ubuntu# mkdir /mnt/ubusda3

root@ubuntu:/home/ubuntu# mount /dev/sda3 /mnt/ubusda3

root@ubuntu:/home/ubuntu# for i in /sys /proc /run /dev; do sudo mount --bind "$i" "/mnt/ubusda3$i"; done

root@ubuntu:/home/ubuntu# chroot /mnt/ubusda3/

root@ubuntu:/# apt-get -V --reinstall install libnih

Reading package lists... Done

Building dependency tree       

Reading state information... Done

E: Unable to locate package libnih

and then i noticed it's libnih1 not linbih (http://packages.ubuntu.com/search?keywords=libnih&searchon=names&suite=oneiric&section=all)

root@ubuntu:/# apt-get -V --reinstall install libnih1

Reading package lists... Done

Building dependency tree       

Reading state information... Done

The following extra packages will be installed:

   winbind (3.5.11~dfsg-1ubuntu2.2)

The following packages will be upgraded:

   winbind (3.5.11~dfsg-1ubuntu2.1 => 3.5.11~dfsg-1ubuntu2.2)

1 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 0 not upgraded.

6 not fully installed or removed.

Need to get 54.7 kB/5,693 kB of archives.

After this operation, 32.8 kB disk space will be freed.

Do you want to continue [Y/n]? y

WARNING: The following packages cannot be authenticated!

  libnih1

Install these packages without verification [y/N]? y

Get:1 http://tr.archive.ubuntu.com/ubuntu/ oneiric/main libnih1 amd64 1.0.3-4ubuntu2 [54.7 kB]

Fetched 54.7 kB in 0s (57.1 kB/s)  

Can not write log, openpty() failed (/dev/pts not mounted?)

(Reading database ... 196784 files and directories currently installed.)

Preparing to replace winbind 2:3.5.11~dfsg-1ubuntu2.1 (using .../winbind_2%3a3.5.11~dfsg-1ubuntu2.2_amd64.deb) ...

/sbin/runlevel: error while loading shared libraries: libnih.so.1: wrong ELF class: ELFCLASS32

 * Stopping the Winbind daemon winbind

   ...done.

Unpacking replacement winbind ...

Preparing to replace libnih1 1.0.3-4ubuntu2 (using .../libnih1_1.0.3-4ubuntu2_amd64.deb) ...

Unpacking replacement libnih1 ...

Processing triggers for man-db ...

Processing triggers for ureadahead ...

ureadahead will be reprofiled on next reboot

Can not write log, openpty() failed (/dev/pts not mounted?)

Setting up libwbclient0 (2:3.5.11~dfsg-1ubuntu2.2) ...

Setting up samba-common (2:3.5.11~dfsg-1ubuntu2.2) ...

Setting up winbind (2:3.5.11~dfsg-1ubuntu2.2) ...

 * Starting the Winbind daemon winbind

/usr/sbin/winbindd: error while loading shared libraries: libcap.so.2: wrong ELF class: ELFCLASS32

   ...fail!

invoke-rc.d: initscript winbind, action "start" failed.

dpkg: error processing winbind (--configure):

 subprocess installed post-installation script returned error exit status 127

Setting up libsmbclient (2:3.5.11~dfsg-1ubuntu2.2) ...

Setting up samba-common-bin (2:3.5.11~dfsg-1ubuntu2.2) ...

Setting up smbclient (2:3.5.11~dfsg-1ubuntu2.2) ...

Setting up libnih1 (1.0.3-4ubuntu2) ...

Processing triggers for libc-bin ...

ldconfig deferred processing now taking place

Errors were encountered while processing:

 winbind

E: Sub-process /usr/bin/dpkg returned an error code (1)

This time i'm getting same boot error for libnih-dbus.so.... file.

Also for finding other 32bit files, i executed your commands and i see all files in /mnt/ubusda3/lib/modules/3.0.0-12-generic/ and /mnt/ubusda3/bin are 32 bit.

Is it possible to reinstall whole kernel files ?