The USB boot disk needs to be redone. The system is installed in the middle of the exit, reinstall the system can be, you can not recognize, the USB disk may also have a problem.
I have an old Lenovo laptop I bought in 2009 with an Intel i3 CPU, the exact model is unknown. I installed an Ubuntu on a whim over the weekend, but halfway through the installation, the USB disk became loose and the system was interrupted. Now that Windows has been removed, the computer can boot up, but Ubuntu cannot run.
When the computer starts up, the BIOS is opened, and the USB flash drive boot item cannot be found. Based on the previous answers, it is possible that the BIOS was damaged due to an installation interruption. Now I don't know the specific solution, so I hope someone can help me and tell me the specific operation process. If possible, I will send you a private message.
Installing Ubuntu is purely for use of the computer's spare heat, so I don't need to spend money on it. Hopefully someone can offer a solution that doesn't cost anything.
In other words, it is possible that the so-called "PE installation disk" is also a solution, and I hope someone can help me to guide it.
Thank you very much.