Random characters starts showing on terminal on Ubuntu 20.04.3 TS

I see below characters on Ubuntu 20.04.3 which is wierd. I am new to Ubuntu so please assist with this issue.

1. Random characters like given below shows up on terminal
2. Even when characters dont show up, the sound of repeated keyboard typing is heard.
3. Randomly it starts deleting the entered characters, like backspace character being pressed

^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^["^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~^

or "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"

Solution 1:

Your Delete (not your Backspace) key is stuck or faulty. The terminal prints this key as ^[[3~ if it not handling special keys.

Try to release it. If this doesn't work, and the problem persists after rebooting, clean or replace your keyboard.