How to fix bash: ./myprogram: No such file or directory?

Question

linux

When installing in the Ubuntu terminal through the command ./myprogram(./myprogram wrote purely for an example), writes bash: ./myprogram: No such file or directory
How to solve?

Answer 1

when installed in the Ubuntu terminal via the command ./

It's not a setting and it's not a command.
chmod +x myprogram

Answer 2

chmod a+x ./myprogram ??

Answer 3

do you have myprogram in the current directory? Is this a bash script?