Have old computer running Windows 7: CPU - AMD FX-8350; Graphics Card - MSI AMD Radeon R7 240 - MB: GIGABYTE GA-990FXA-UD3 AM3; SSDs (2) - ADATA USA Premier Pro 2.5-Inch 128GB SATA III. Got Ubuntu, put on USB thumb drive and booted from thumb drive (Try without installing). Got to the desktop but old HP keyboard and mouse don't work. (Keyboard did work at boot menu.) Without rebooting, replaced them with newer Logitech keyboard and mouse. They worked.
Decided to install Ubuntu. Shut down, removed SSD with Windows and installed a clean SSD. Rebooted, selected Install from boot menu. Got background screen with window to select language but keyboard and mouse don't work.
Put computer back in original condition. Boots to Windows and keyboard and mouse work. Booted Ubuntu from USB stick, both Try without installing and Install, and keyboard and mouse don't work.
This is my first foray out of the Windows world. What am I missing?