The most likely culprit is that line 12 calls a program that isn't installed on your system.
Open your script ( nano download.sh ), look at line 12, and see what command is there (e.g., wget , curl , git , or unzip ). download.sh 12 not found
Sometimes "Command not found" is a masked permission error. Ensure the script has the right to execute: chmod +x download.sh Use code with caution. How to Debug Fast The most likely culprit is that line 12
NAME = "User" will fail. It must be NAME="User" (no spaces). Ensure the script has the right to execute:
If you downloaded download.sh or edited it on Windows, it likely has line endings. Linux expects LF . This often causes the shell to misread commands or see "ghost" characters at the end of a line. The Fix: Run the dos2unix utility to clean the script:
./myscript.sh Linux does not look in the current directory for executables unless you explicitly tell it to with ./ . 4. Syntax Errors (Spacing Matters)