I attempted to perform the subject task. Configured the boot to be UEFI and Sata to be AHCI. Mine is i5 Vpro with 4GB of ram. Error is no bootable drive detected after successful install with no error. Live USB is done using UUI
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Although you say you "configured the boot to be UEFI", please make sure that your PC has an
EFI based BIOS, because DELL Latitude e6420 is an older model, which may have legacy BIOS.
Boot from Ubuntu installation media, open GParted - View - Device Information.
In case it has Legacy BIOS, make sure that the disk has a msdos partition table.
In case it has an UEFI BIOS, make sure that the disk has a gpt partition table.
When it does not match, create a new matching partition table and reinstall.
More comprehensive information on how to prepare the disk you find here.
