Can I install new Ubuntu 20.04 in UEFI mode, if I already have installed it on the same server in Legacy BIOS mode

Asked by Vuk Gojnic on 2021-04-03

I am trying to do the re-installation of Ubuntu 20.04 on the HPE DL325 Gen10+ server in UEFI mode from custom ISO (Kernel, Ramdisk, ESP).

Previously that server was in Legacy BIOS mode and Ubuntu 20.04 exists already on it.

After Grub2 starts booting process the screen freezes and shows only red non-blinking underscore.

What do I need to do to enable new OS instance to be installed propperly?


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Installing in non-UEFI mode is installed properly. If you are not using Windows then you don't need UEFI.... Are you reinstalling Ubuntu to get UEFI enabled when it's already installed?

Vuk Gojnic (vukgojnic) said : #2

I have Ubuntu 20.04 installed when the server was in Legacy BIOS mode.

I have changed the settings of the server to UEFI and I am trying to start Ubuntu based Ramdisk and Kernel, but this is where it blocks. Grub starts the booting of /vmlinuz and initramfs and blocks.

Drew Howden (drewhowden) said : #3

All you need to do is switch to UEFI mode, and reinstall Ubuntu Server as you normally would.

Since you have a Ubuntu Server installation in Legacy mode, you will want to erase the disk in order to avoid any issues.
*This WILL erase all data on your server! So make sure to have a backup copy of everything on your server!

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