This is where I am logging everything I know about Linux. There are so many distros out there. Whatever here works on debian based system like Ubuntu or Linux Mint, and might need a slight tinkering for other distros.
ls -l- long listing the file
ls -lrt- list file based on the modified date. recent at the last.
Most of the modern distros support double clicking deb file to install. Some times, you may need to do the below.
chmod +x installer-file.deb- Give execute permission
dpkg -i installer-file.deb- You may need to use