i have installed Ubuntu 16.04 after an advise from a friend about how nice is that operating system.i found it fast and have a good GUI to deal with.But i mistakenly unmounted the partitions of my computer,so now i cannot access these partitions now and all files of my laptop.please help thank you.

You indicate you have Ubuntu installed and make no mention of any other operating system. Since it is not possible to "unmount" a system in use, yu will have to be a lot more specific on what you did an how you did it.

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yes ,i already have a windows 8 operating system,i forgot to say that,sorry

yes i have windows 8 ,but the problem is i can not find my partitions on Ubuntu OS only

yes, would be nice to tell what did you umount (and exactly how). But probably a reboot may help.

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how did you unmount them?
if they are Linux partitions or in your fstab then just do this.
to remount everything in the fstab file.

if you are looking for your Ubuntutututu Partitions in Windows you will never find them. Windows only sees them as a partition in the disk management app. Or a partition that needs to be formatted.

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the icons on the left of the screen ,i R clicked on the partition then i choosed an option that i does not remember then it disappeared from the icons on the left so i cannot find them

no i am looking for the other partitions,that i could not find them on the left icons on the Ubuntu screen

have you already tried to reboot? probably you lost only your icons, but not the mounts.
You may try to open a shell and execute a mount command. Just check what is mounted at all.

did you open a file manager to see if you can psychically find them? Icon is just a short cut to them.
in your cli to list all connected hard drives / partitons.

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[QUOTE=BW-userx;5664485]did you open a file manager to see if you can psychically find them? Icon is just a short cut to them.
in your cli to list all connected hard drives / partitons.[/QUOTE

thank you for your effort. i found the partitions , but while trying to open them the following message appeared :
Error mounting /dev/sda6 at /media/ahmed/NEWW: Command-line `mount -t "ntfs" -o "uhelper=udisks2,nodev,nosuid,uid=1000,gid=1000" "/dev/sda6" "/media/ahmed/NEWW"' exited with non-zero exit status 14: The disk contains an unclean file system (0, 0).
Metadata kept in Windows cache, refused to mount.
Failed to mount '/dev/sda6': Operation not permitted
The NTFS partition is in an unsafe state. Please resume and shutdown
Windows fully (no hibernation or fast restarting), or mount the volume
read-only with the 'ro' mount option

[QUOTE=Ahmed Abdellatif;5664511]You are now experiencing the Windows effect.

If you are trying to get to windows via Linux you will now need to make adjustments to Windows in how it shuts down so that will hopefully go away.

I reboot windows then let it boot into Linux to keep it in a non hibernation state even though I made the changes.

You should also make sure you have ntfs-3g installed on your Linux box.

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[QUOTE=BW-userx;5664525]are you ask me to to write that code in the Ubuntu terminal ?

you got to go into windows and change some settings in your power management ....

Yow are right.I searched how to turn the hybrid and hibernation off.
i opened the CMD as Administrator then typed powercfg.exe /hibernate off, then pressed enter then typed save the pressed enter.When i opened the Ubuntu OS i opened the partitions easily and have no problem.
finally thank you