grub cmd line opens at boot

https://answers.launchpad.net/ubuntu/+source/grub2/+question/113737

Did you MD5 test the wubi file you downloaded?

I suggest you to install Ubuntu NOT using Wubi.

If you have installed Ubuntu via Wubi please uninstall it read
http://wubi-installer.org/faq.php and https://wiki.ubuntu.com/WubiGuide

Installing Ubuntu using Wubi make Ubuntu less robust and all problems that you will have to Windows can be affect your Ubuntu partition file.

Please note that install Ubuntu using Wubi isn't the best you can do, nothing wrong, but installing a secure operative system Ubuntu into an
unsecure operative system using Wubi is not the better choice you can do: problems that come in Windows might be damage your Ubuntu
installation.

Wubi does not install Ubuntu directly to its own partition.
Wubi install Ubuntu into a big file as an image file on the NTFS partition.

So you are free to try Ubuntu in this way but if you want perform a
regular Ubuntu dual boot mode installation, to have Ubuntu partitions
isolated from Windows partitions: please made a new question.

Here more detail: http://en.wikipedia.org/wiki/Wubi_(Ubuntu_installer)

I strongly suggest you to install Ubuntu+Windows in dual mode creating a real Ubuntu ext3 or ext4 partition.
In this mode you can use Ubuntu and Windows ad usual and then using installed Ubuntu you can save or repair damaged (due viruses or other issue) Windows partitions data.

- Here the steps to install Ubuntu 10.04 https://help.ubuntu.com/community/GraphicalInstall

Is very easy to install, if you need info please ask.

Welcome to Ubuntu

Thank you

Here some general note and howto:

The main ubuntu site is this: www.ubuntu.com and the download location is this
http://www.ubuntu.com/desktop/get-ubuntu/download

Prerequisites: https://help.ubuntu.com/community/Installation/SystemRequirements
Please also be sure to read the release notes: https://wiki.ubuntu.com/LucidLynx/ReleaseNotes

1) please download the 700 mb file http://www.ubuntu.com/desktop/get-ubuntu/download simply press on download button
To avoid download errors please prefer to download the desired ubuntu iso install cd image using the torrent protocol.
2) check the md5sum of downloaded file to be sure it have no error https://help.ubuntu.com/community/HowToMD5SUM

Only if the md5sum number match with this: http://releases.ubuntu.com/10.04/MD5SUMS go to the next steps otherwise
install a torrent client i suggest you http://deluge-torrent.org/ if you are using Windows and download the iso using a .torrent link from here:
http://releases.ubuntu.com/10.04/ubuntu-10.04-desktop-i386.iso.torrent

3) burn the iso image onto a cd, to do it install and use http://infrarecorder.org/?page_id=5
4) insert the self made install cd into your pc cdrom drive and reboot your pc. You must not see Windows starting and you can try Ubuntu from cdrom and then install it

If you have trouble with installation (the system freeze or you can't complete it) be sure to read the above suggestions, then:

1.a ) Please boot entirely (you must not see windows starting) from Ubuntu live install cd and when the system start to boot from cd you will see two bottom screen icons (keyboard and man inside circle ) please press space (choose your desired language) then a screen textual center menu will appear to you with this items in it:

Try Ubuntu without installing
Install Ubuntu
Check disc for defects
Test memory
Boot from first hard disk

Please select "Check disc for defects" and press enter to test if your cd-driver can read in a good way the live install cd... or if the install cd have some defective file in it.
Then please also perform a Test memory to be sure your pc RAM memory have not any issue

http://www.ubuntugeek.com/how-to-fix-ubuntu-10-04-lts-lucid-blank-screen-at-startup.html

---- Trouble with intel8xxx graphic cards:

please try this: https://wiki.ubuntu.com/X/Bugs/Lucidi8xxFreezes

got it, just rebooted like 5 times