jojo's questions

I've tried to update but then I got this error

Here's the error information in that box:

W:GPG error: http://extras.ubuntu.com precise Release: 
The following signatures were invalid: BADSIG 16126D3A3E5C1192 Ubuntu Extras Archive Automatic Signing Key <[email protected]>, 
W:Failed to fetch http://ppa.launchpad.net/unity-team/hud/ubuntu/dists/precise/main/source/Sources  404  Not Found,
W:Failed to fetch http://ppa.launchpad.net/unity-team/hud/ubuntu/dists/precise/main/binary-i386/Packages  404  Not Found, 
E:Some index files failed to download. They have been ignored, or old ones used instead.

And my Internet connection is working fine.

After trying

$ sudo apt-get install ppa-purge 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
ppa-purge is already the newest version.
The following packages were automatically installed and are no longer required:
  language-pack-zh-hans language-pack-kde-en language-pack-kde-zh-hans
  language-pack-kde-en-base kde-l10n-engb kde-l10n-zhcn
  language-pack-zh-hans-base firefox-locale-zh-hans
  language-pack-kde-zh-hans-base
Use 'apt-get autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

$ sudo ppa-purge ppa:unity-team/hud
Updating packages lists
W: GPG error: http://extras.ubuntu.com precise Release: The following signatures were invalid: BADSIG 16126D3A3E5C1192 Ubuntu Extras Archive Automatic Signing Key <[email protected]>
W: Failed to fetch http://ppa.launchpad.net/unity-team/hud/ubuntu/dists/precise/main/source/Sources  404  Not Found    
W: Failed to fetch http://ppa.launchpad.net/unity-team/hud/ubuntu/dists/precise/main/binary-i386/Packages  404  Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
Warning:  apt-get update failed for some reason
PPA to be removed: unity-team hud
Warning:  Could not find package list for PPA: unity-team hud

I've tried

$ sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 16126D3A3E5C1192 
Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring /tmp/tmp.v6Ucus0B10 --trustdb-name /etc/apt/trustdb.gpg --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --recv-keys --keyserver keyserver.ubuntu.com 16126D3A3E5C1192
gpg: requesting key 3E5C1192 from hkp server keyserver.ubuntu.com
gpg: key 3E5C1192: "Ubuntu Extras Archive Automatic Signing Key <[email protected]>" not changed
gpg: Total number processed: 1
gpg:              unchanged: 1

And then started the same procedure but of no use.

I've deleted my existing swap partition due to some partitioning problem. I don't have a swap space now so I've created a swap file with:

dd if=/dev/zero of=/root/myswapfile bs=1M count=1024

Here's after swapon -s:

/root/myswapfile    file    1048572    1320    -1

Now I want to edit my /etc/fstab to enable the swap file after reboot.

I've just installed Ubuntu 12.04,the screen resolution is stuck at 1920x1280.everything appears big,its not comfortable to look at. There is no such option about screen resolution.

I got into the displays setting. I've only 2 screen resolutions 1024x800,800x600.how can i add 1280x800 or other such resolutions?

lspci shows this:

00:02.0 VGA compatible controller [0300]: Intel Corporation 82945G/GZ Integrated Graphics Controller [8086:2772] (rev 02)

This is what I got after checking for drivers: