I am not being to access any functions in my desktop and I don't have an OS besides Ubuntu and I am new to Ubuntu. I think I rebooted my computer thinking that Google Chrome crashed. I opened Google Chrome but it showed opening message but never opened so I restarted my computer. and when my system was loading (I was playing with keyboard dont know what I typed) and when by Ubuntu loaded, I was unable to access anything some of characteristics are listed below:

• I cannot hear any sound

• I cannot access wired ethernet connection on the right corner where I usually enable to access internet and I have no internet.

• There is no local apache server either. when ever I try to start apacer I get setuid must be root or something.

• When I type sudo then I get message setuid must be root.

• I cannot access orther external storage devices like pendrive and portable hard drive and cannot mount my other drives with FAT32 filesystem.

• When I try to start my apache webserver with out typing sudo then I get message cannnot open socket or something like it.

• I remember also doing command

  chown -R www-data / 
  

  earlier and got error message

• I cannot shutdown my computer, it only logs off