hello ,
i just install ubuntu on JUST 10Go ,
But i can't see the GRUB , i can't access to my WINDOWS & my FOLDERS any Mooooore !
PLEAAAAAAAAAAAASE HELP ME !

Did you install Ubuntu to sda?
Did you install the bootloader (GRUB) to the MBR of sda?

I think i have lost all my folders , because there nothning in the demo version , in the installation i ve choose the tird choice ! It delete all my documments ! Îm so mad ! I now i gave to intall linux one more timz

You haven't posted enough information for anyone to actually be able to help you. Boot the Ubuntu installation medium again and open a terminal and type the following command: sudo fdisk -l(Lower Case Letter L in the command). This should output some information on drives/partitions you can post here so we can tell if you still have your windows partitions.

The options vary so saying the third one doesn't tell much. Alongside, Erase disk, something Else? What windows version do you have?

This kind of thing is very annoying. Please do not do it.

What is that? Many installers have a choice between install to entire disc (automatic), guided partitioning and expert installation. Or some variation thereof. Which did you choose?

Is there any particular reason you do not have backup copies of important files?

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Disk /dev/sda: 750.2 GB, 750156374016 bytes
255 heads, 63 sectors/track, 91201 cylinders, total 1465149168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x0001ab94

Device Boot Start End Blocks Id System
/dev/sda1 2048 1456936959 728467456 83 Linux
/dev/sda2 1456939006 1465147391 4104193 5 Extended
Partition 2 does not start on physical sector boundary.
/dev/sda5 1456939008 1465147391 4104192 82 Linux swap / Solaris

Disk /dev/sdb: 7756 MB, 7756087296 bytes
255 heads, 63 sectors/track, 942 cylinders, total 15148608 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: 0xfdc01076

Device Boot Start End Blocks Id System
/dev/sdb1 * 63 15148607 7574272+ b W95 FAT32



this is the msg , thank you so much !

i just write to you from a demo version ! its installing

What does "demo version" mean? What have you exactly tried? How do you expect any help without answering our questions?

I mean that when yiu insert the USB and you chooses the default mode , you have linux just to try it , then there is the setup ! Now my pc doen t print anything , just a black screen after a mark s logo !! I.m sorry if i can t give you more information ! I just confused ! I ve lost all my folders

It looks like your hard drive information has been removed.

This:

• Device Boot Start End Blocks Id System
  /dev/sda1 2048 1456936959 728467456 83 Linux
  /dev/sda2 1456939006 1465147391 4104193 5 Extended
  Partition 2 does not start on physical sector boundary.
  /dev/sda5 1456939008 1465147391 4104192 82 Linux swap / Solaris

This shows that your hard drive 'hda' is partitioned to use Linux, not Microsoft Windows.

Because you installed and used your whole hard drive, you erased some files, too. You have removed things from your computer including the names and listings of all of your files. Some of your files may be there, but they are not listed and not easy to find anymore. Your computer still works, but getting files back is not easy and I do not know how to help you myself. My advice is "Do not make any further changes to your computer until you make a decision about what to do next. Any changes can make it harder to recover files." If you have lost very expensive files or very important files, consider hiring an expert who can follow the instructions to get back some files. Someone has posted instructions that might help an expert here: http://www.dedoimedo.com/computers/l...-recovery.html but these instructions are complicated. I'm sorry that I do not know how to do something complicated like that.