idiot's questions

After upgrading to kernel 3.2.0-31-generic-pae, my Ubuntu machine is unable to take updates and shows some errors. Also, the update-notifier stays in my tray.

I tried sudo apt-get install -f but it gave me the following output:

$ sudo apt-get install -f
[sudo] password for balakrish: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Correcting dependencies... Done
The following packages were automatically installed and are no longer required:
  lcdproc-extra-drivers libg15render1 libsdl-gfx1.2-4 libsvga1 libsdl-net1.2
  libxosd2 libmikmod2 libzeitgeist0.8-cil libtaoframework-sdl1.2-cil
  libg15daemon-client1 libsdl-mixer1.2 libtaoframework-opengl3.0-cil lcdproc
  libnunit2.5-cil libsmpeg0
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
  linux-headers-3.2.0-31-generic linux-headers-3.2.0-31-generic-pae
The following NEW packages will be installed:
  linux-headers-3.2.0-31-generic linux-headers-3.2.0-31-generic-pae
0 upgraded, 2 newly installed, 0 to remove and 55 not upgraded.
2 not fully installed or removed.
Need to get 0 B/1,958 kB of archives.
After this operation, 22.4 MB of additional disk space will be used.
Do you want to continue [Y/n]? Y
(Reading database ... 513139 files and directories currently installed.)
Unpacking linux-headers-3.2.0-31-generic (from .../linux-headers-3.2.0-31-generic_3.2.0-31.50_i386.deb) ...
dpkg: error processing /var/cache/apt/archives/linux-headers-3.2.0-31-generic_3.2.0-31.50_i386.deb (--unpack):
 error creating directory `./usr/src/linux-headers-3.2.0-31-generic/include/config/comedi/usb': No space left on device
No apport report written because the error message indicates a disk full error
                                                                              dpkg-deb: error: subprocess paste was killed by signal (Broken pipe)
Unpacking linux-headers-3.2.0-31-generic-pae (from .../linux-headers-3.2.0-31-generic-pae_3.2.0-31.50_i386.deb) ...
dpkg: error processing /var/cache/apt/archives/linux-headers-3.2.0-31-generic-pae_3.2.0-31.50_i386.deb (--unpack):
 unable to create `/usr/src/linux-headers-3.2.0-31-generic-pae/include/config/comedi/addi/apci/3001.h.dpkg-new' (while processing `./usr/src/linux-headers-3.2.0-31-generic-pae/include/config/comedi/addi/apci/3001.h'): No space left on device
No apport report written because the error message indicates a disk full error
                                                                              dpkg-deb: error: subprocess paste was killed by signal (Broken pipe)
Errors were encountered while processing:
 /var/cache/apt/archives/linux-headers-3.2.0-31-generic_3.2.0-31.50_i386.deb
 /var/cache/apt/archives/linux-headers-3.2.0-31-generic-pae_3.2.0-31.50_i386.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

df gives this output:

balakrish@balaKrish:~$ df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda15       35G  3.0G   30G  10% /
udev            1.9G  4.0K  1.9G   1% /dev
tmpfs           766M  876K  765M   1% /run
none            5.0M     0  5.0M   0% /run/lock
none            1.9G  356K  1.9G   1% /run/shm
/dev/sda16       25G   20G  3.5G  86% /home
/dev/sda14      6.9G  5.0G  1.7G  76% /usr
/dev/sdb1        74G   31G   40G  44% /media/Miscellaneous
/dev/sda7       120G  119G  1.2G 100% /media/Library
/dev/sda12      100G   31G   70G  31% /media/Songs

sudo fdisk -l gives this:

balakrish@balaKrish:~$ sudo fdisk -l

Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0002f59b

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *          63   125837144    62918541    7  HPFS/NTFS/exFAT
/dev/sda2       125837206  1953503999   913833397    f  W95 Ext'd (LBA)
/dev/sda5       125837208   293603939    83883366    7  HPFS/NTFS/exFAT
/dev/sda6       293604003   461370734    83883366    7  HPFS/NTFS/exFAT
/dev/sda7       461370798   713028959   125829081    7  HPFS/NTFS/exFAT
/dev/sda8       713029023   808298602    47634790    7  HPFS/NTFS/exFAT
/dev/sda9       880795818  1132453979   125829081    7  HPFS/NTFS/exFAT
/dev/sda10     1132454043  1227834214    47690086    7  HPFS/NTFS/exFAT
/dev/sda11     1300220838  1447022744    73400953+   7  HPFS/NTFS/exFAT
/dev/sda12     1447022808  1656735254   104856223+   7  HPFS/NTFS/exFAT
/dev/sda13     1656735318  1953503999   148384341    7  HPFS/NTFS/exFAT
/dev/sda14     1285543936  1300219903     7337984   83  Linux
/dev/sda15      808300544   880795647    36247552   83  Linux
/dev/sda16     1227835392  1279238143    25701376   83  Linux
/dev/sda17     1279240192  1285537791     3148800   82  Linux swap / Solaris

Partition table entries are not in disk order

Disk /dev/sdb: 80.0 GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders, total 156301488 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00028680

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1              63   156301487    78150712+  83  Linux

ls /usr/src output:

balakrish@balaKrish:~$ ls /usr/src
linux-headers-3.2.0-24              linux-headers-3.2.0-27-generic
linux-headers-3.2.0-24-generic      linux-headers-3.2.0-27-generic-pae
linux-headers-3.2.0-24-generic-pae  linux-headers-3.2.0-29
linux-headers-3.2.0-25              linux-headers-3.2.0-29-generic
linux-headers-3.2.0-25-generic      linux-headers-3.2.0-29-generic-pae
linux-headers-3.2.0-25-generic-pae  linux-headers-3.2.0-30
linux-headers-3.2.0-26              linux-headers-3.2.0-30-generic
linux-headers-3.2.0-26-generic      linux-headers-3.2.0-30-generic-pae
linux-headers-3.2.0-26-generic-pae  linux-headers-3.2.0-31
linux-headers-3.2.0-27              vboxhost-4.1.20

I upgraded from ubuntu 11.10 to 12.04LTS version. Mine is 32bit OS. I run virtual box on my machine. In virtual box i run bt5r2(64bit) version. When i was running 32bit version of bt5r2,it worked fine. But this 64bit version of backtrack just freezes my pc and i have to restart my pc. But one thing i noticed is, i also run ubuntu 11.10 server Edition(32 bit). When i start backtrack first,it freezes my pc. but if i start ubuntu server,then backtrack it just runs fine. I think memory allocation is the problem. I enabled Hardware Virtualization(VT-d).

my pc configuration:

• Intel® Core™ i3 CPU 540 @ 3.07GHz × 4
• 4GB DDR3 RAM

I use Ubuntu 12.04 with Gnome3. Whenever I press backspace in terminal(no text to delete) it gives me a sound and blinks the screen. I disabled the sound using system settings -> Sound -> Sound Effects -> Alert volume -> off

But I don't know how to disable the blinking screen. How to disable it?

I know -X -Y options in ssh for X11 forwarding.But these options open the gui apps on my pc.But I want to open a gui application "exactly" on target machine. So please help me with this. I tried this but ended up with the following error.

No protocol specified
No protocol specified
No protocol specified
Error: cannot open display: :0

Is there any way to open the desktop display from terminal(ssh login)?