sudo dpkg –configure -a

This should be a bug for ubuntu-software-center and hope this bug be fixed in next version!

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Normally,I’ll try following when I get into this error:

gpg --keyserver subkeys.pgp.net --recv D739676F7613768D
gpg --export --armor D739676F7613768D | sudo apt-key add -

“D739676F7613768D” is the key after no_pubkey in error report.Commonly I will fix the problem out.
When I read this thread,I’m feeling so lucky and this is the orbicular solution for the problem
http://forum.ubuntu.pl/showthread.php?t=37547

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1.Mount the Windows partition.

Use this command to determine the device name of Windows,always Windows installed in first partition of first hard disk.

sudo fdisk -l

Create a mount point and mount the partition:

sudo mkdir /media/WinXP

sudo mount /dev/sda1 /media/WinXP -t ntfs -o rw

Change /dev/sda1 to the device name.

2.Download archivetar,and extract to the root directory of Windows partition.

Use following command to extract the package.

cd /media/WinXP

sudo tar -xzvf ~/Archive.tar.gz

And run this command,you should see the three files:boot.ini,NTLDR,NDETECT.COM

3.Edit boot.ini(if your Windows partition is sda1,skip this step).

sudo nano /media/WinXP/boot.ini

Change all “partition(1)” to “partition(n)”,for example,your Windows partition is dev/sda5,change all “partition(1)” to “partition(5)”.Ctrl+O and Enter to save file,the Ctrl+X to close.

4.Edit /boot/grub/menu.lst

gksudo gedit /boot/grub/menu.lst

Find this section:

title        Microsoft Windows XP Professional
rootnoverify    (hd0,0)
savedefault
makeactive
chainloader    +1

and delete the line “makeactive”,if there’s no this section,add it to the end without “makeactive”.(hd0,0) stands for the first partition of the first hard drives.

5.Rebuild Boot sector.

Download the http://www.cgsecurity.org/testdisk-6.10.linux26.tar.bz2

Run following commands:

tar xvf testdisk-6.10.linux26.tar.bz2
sudo testdisk-6.10/linux/testdisk_static /dev/sda

Enlarge the terminal window and:

Press “enter” to “proceed”
Press “enter” to select “intel”
Use the “down arrow” and “enter” to select “advanced”
Use the down error to select the “XP” partition and then “enter” to select “boot”
Use the “right arrow” key and “enter” to select “Rebuild BS”
This might take a while. Once done:
Use the “right arrow” key and “enter” to select “write”. This will write a modified boot sector to the Windows partition.
Then just follow the instruction on the screen to save to quit testdisk.

Reboot.

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Try these steps:

Hold down Alt+Sys Rq(PrtScn key)key combination.

There will be no visible output,while hold down the key combination,

Then press these keys in the order,one by one

R

E

I

S

U

B

Spells “busier” backwards,and the system will be reboot after B is typed in the safe way.

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The error message “Malformed line 62 in source list /etc/apt/sources.list” means something wrong of the line 62 in file source.list.

Use the following command in terminal :

cat -n /etc/apt/source.list | grep 62

You will see the content of the line like this:

wraith@wraith-desktop:~$ cat -n /etc/apt/sources.list | grep 62
62    deb-src http://ppa.launchpad.net/chromium-daily/ppa/ubuntu jaunty

Run following command ,then find out the above and make a change.I lost main at end of the line and I just add it.

sudo gedit /etc/apt/source.list

If you’ve no idea with it,just delete it.Close and save the file and done.

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2.If you deleted Linux partitions incautiously,when restart the computer Grub will be loading error and the computer doesn’t boot any startup disks.

This article may help you if you have the problems above.

Grub doesn’t work when you reinstall Windows:

First,go into the BIOS and set the CD to be the first boot device.

then,you need a Linux install CD and boot from the CD.

Open a terminal window after startup,and execute the command:

sudo grub

find /boot/grub/stage1

root (hd0,x)

setup (hd0)

where “x” is a number presented after execute “find /boot/grub/stage1″

restart your computer,and hope this helps you.

Loading Grub error:

First,also go into BIOS and set the CD to be the first boot device.

then you need a Windows install CD and boot from the CD.

Press R to go to the recovery console when it asks you whether you want install windows etc.

startup disks include Windows will be present to you

enter the number at the beginning of Windows,then you will go to command line.

For XP or NT users:

C:\WINDOWS\cd..

C:\fixboot c:

C:\fixmbr

and for DOS based system use “fdisk /mbr”

Tips:

select the new entry by execute command:

C:\bootcfg /rebuild

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