Get black screen when trying to install Ubuntu

# If you are trying to install Ubuntu

### 1. Ensuring your CD/DVD or USB flash drive burned/written correctly and not damaged:

* How to MD5 test Ubuntu ISOs. See also: Where to find the checksums of Ubuntu ISO images?
* Check out these steps to see how to check your CD once you boot into it to make sure it's ready to go.
* Verify the integrity of the burned CD/DVD or written USB flash drive (this also checks that it's accessible by the computer on which you wish to install).

### 2. Black/purple screen when you try to boot the LiveCD

The Ubuntu installer's startup portion is sometimes incompatible with
 certain graphics cards. Fixing it and getting to the Ubuntu Desktop to
try or install it can often be surprisingly easy fix: the `nomodeset` parameter. To see if it works for you:

* Boot from the Desktop Live CD and press the `↓` key when you see the below:
* Press `Enter` and select English:
* Press F6, use the `←` `↑` `→` `↓` keys to go down to `nomodeset`, and press `Enter`. An *x* will appear to its left. Then press `Esc`, and press `Enter` to "Try Ubuntu without installing."

You can also try `acpi = off` and `nolapic` if `nomodset` also shows up as a black screen.

## 3. Black screen

or
--

## when installing to an UEFI capable machine:

Ubuntu's installer 'when attempting to run in UEFI mode) will hang
and stop due to different manufacturer's implementations of the UEFI
specification and will hang in different ways.
To identify if your machine is booting in installer UEFI mode you will
see

REF: UEFI Community Ubuntu Documentation Section 2.4

=== If your machine is CSM capable (which is a full UEFI implementation
with an emulated BIOS layer) after selecting any option from the grub
list the system will hang at a black screen. ===

The picture above actually only confirms your DVD/USB booted using
UEFI and there will be some means in firmware settings to ensure drives
are booted in order to make the UEFI installer run (a solution may
possibly be as simple as ensuring SATA is set to AHCI) - check your
vendors manual! Also check the UEFI Community Documentation Section 2.3 for more details.

What you need to do first is to disable SECURE BOOT in the firmware settings.
If that does not get the Ubuntu installer running, try disabling anything mentioning UEFI in the firmware settings.
Or
If you cannot find UEFI settings then enable CSM - this will disable the
 UEFI booting of the installer and then allow a legacy/BIOS install of
Ubuntu.
Installing grub-efi afterwards will allow UEFI to be re-enabled. Again refer to UEFI Community Ubuntu Documentation at Section 4

=== Some machines use a full BIOS with an emulated UEFI layer which may
throw errors as described ie "you need to load the kernel first" and
"can not read file/cd0" ===

Not all of these machines implement Secure Boot. Simply selecting
UEFI in the BIOS settings will configure UEFI mode on hard drives. There
 is no solution for these errors and the workaround is to disable UEFI
to enable the Ubuntu installer to run in legacy mode; after which
boot-repair can be used to install `grub-efi` which then
allows/needs UEFI switched back on before Ubuntu will boot using UEFI.
Once again refer to the UEFI Community Ubuntu Documentation at Section 4

## Black/purple screen *after* you boot Ubuntu for the first time

This usually happens because you have an Nvidia or AMD graphics card, or a laptop with *Optimus* or switchable/hybrid graphics, and Ubuntu does not have the proprietary drivers installed to allow it to work with these.

The solution is to boot Ubuntu *once* in `nomodeset` mode (your screen may look weird) to bypass the black screen, download and install the drivers, and then reboot to fix it for ever.

* Start your computer, and press the `Right Shift` when booting up, to get the Grub menu. Use the `←` `↑` `→` `↓` keys to navigate/highlight the entry you want (usually the first one).
* Press `e` to edit that entry, which will show you the details:
* Find the `linux` entry as shown above, use the `←` `↑` `→` `↓` keys to get to it, and then press the `End` key to get to that line's end (which may be on the next line!).

* + Enter `nomodeset` as shown, and press `Ctrl`+`X` to boot to where you can successfully install your graphics drivers.

If you are running Ubuntu 12.04 or 12.10, and have a ATI/AMD graphics card, you have to follow the instructions here, otherwise you will run into this problem every time you restart your computer.

### LUKS encryption

In case you've installed Ubuntu with LUKS encryption / LVM option, it
 could be that Ubuntu just asks you for your password - and you cannot
see it.
If you have a black screen, try pressing `Alt`+`←` and then `Alt`+`→` to switch your tty, this may bring back the password query and turn backlight back on.

If you have a purple screen (maybe you need to set the `nomodeset`-option
 also?) and you have encrypted your complete Ubuntu installation, try to
 just type your encryption/LUKS-password after waiting some seconds (or
minutes, just to be sure) and continue with a press on `Enter`. If this is successfull, you should see your Login-screen just a few seconds later.

1. Try the Alternate Installer - this is a text based installer that might work better than the liveCD depending on your hardware.

*If you do this, you may get a black screen before you even hit grub. A simple `Ctrl`+`Alt`+`Del` gets some users to a usable grub screen*

1. If you have an Nvidia Optimus card you should NOT install nvidia drivers, just use the built in driver, see here:

1. * Is a NVIDIA GeForce with Optimus Technology supported by Ubuntu?
2. After selecting boot options you have the opportunity to edit the boot flags manually using your keyboard. Replace `quiet splash` with `no splash` to get an idea of what step your system is failing at. Using that information search the forums or the internet for answers from the community.

1. If you still can't install Ubuntu then unfortunately you've probably run into a hardware specific bug, please see here: How do I report a bug?