I downloaded the XAMPP .run file from Apacheandfriends but the installation isn't working for me.

I can't seem to navigate to my downloads folder and it just keeps saying command not found all the time.

    root@john-Aspire-V3-531:/home/john# cd ~/downloads
    bash: cd: /root/downloads: No such file or directory
    root@john-Aspire-V3-531:/home/john# cd ~/Downloads
    bash: cd: /root/Downloads: No such file or directory
    root@john-Aspire-V3-531:/home/john# /downloads
    bash: /downloads: No such file or directory
    root@john-Aspire-V3-531:/home/john# cd /downloads
    bash: cd: /downloads: No such file or directory
    root@john-Aspire-V3-531:/home/john# cd downloads
    bash: cd: downloads: No such file or directory
    root@john-Aspire-V3-531:/home/john# downloads
    downloads: command not found

What do I need to do? Apacheandfriends says to:

chmod 755 xampp-linux-1.8.2-0-installer.run

and then

./xampp-linux-1.8.2-0-installer.run

but it doesn't seem to think that the file exists.

Can anyone help me?