Author Topic: Black screen after installing Ubuntu  (Read 1809 times)

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Online Mark Greaves (PCNetSpec)

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Re: Black screen after installing Ubuntu
« Reply #15 on: March 08, 2017, 02:27:53 am »
Possibly, but I doubt it .. you can only have four PRIMARY partition, but if one is an extended partition you can have any number of logical partitions.

Linux would likely have created an extended partition containing logical partitions, so you may have 5 partitions but only 4 of them are PRIMARY.

The 4 partition limit doesn't even exist on a hard drive with a GPT partition table which most have now by default.

If you want to check, boot to the LiveCD/LiveUSB and post the output from:
Code: [Select]
sudo fdisk -l
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Offline Trayo

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Re: Black screen after installing Ubuntu
« Reply #16 on: March 08, 2017, 05:05:22 am »
In easyBCD help I found some useful info, I have to enable 'Legacy' Mode by enabling the CSM. but in the Bios UEFI setting It only lists four possible boot options. On looking in security I can see in the right hand pane it says 'CSM Disabled'. With no way to move over to it to enable it. So I need to somehow enable the CSM which allows 3rd party OS installations. It seems microsoft have disabled the CSM in win 8 onwards from installing 3rd party OS'. If this can be solved  I am sure that ubuntu (with grub2) could be installed as a dual boot. Any way around this? Thanks.

Online Mark Greaves (PCNetSpec)

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Re: Black screen after installing Ubuntu
« Reply #17 on: March 11, 2017, 12:43:30 am »
Microsoft haven't disabled CSM, it's a UEFI BIOS setting...

You need to enter your UEFI BIOS and disable "Secure Boot" .. it may then allow you to change the CSM setting.

Be aware - this should be done from within the UEFI BIOS settings .. NOT from within Windows.
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