Lenovo E145: Booting a foreign disk
When having replaced your internal laptop disk, already preloaded with Linux, you can not boot it; if you select it in the boot menu, nothing seems to happen and you return to the boot menu almost immediately.
We have to disable Secure Boot and enable Legacy Boot.
Enter the BIOS setup (from the boot menu, you can under App Menu select Setup).
Under the Security tab select item Secure Boot. You now enter the Secure Boot screen. Set item Secure Boot to Disabled.
Under the Startup tab set item UEFI/Legacy Boot to either Both or Legacy Only. Make sure that item CSM Support is set to Yes.