Permission denied!

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http://askubuntu.com – Two questions: (1) I've just installed Ubuntu 10.04.2 on my Mac Pro and I've also installed clam and avg virus apps. When I scan my home folder clamscan works fine but with avgscan ~/ I get "/home/ron Object scan failed; Permission denied." (2) I have a folder /media/Ubuntu_Data which I created in OS X. In Ubuntu I have a couple of files in my Download folder which I can't drag into this folder. I get "Error while copying to Ubuntu_Data. The destination is read only. I've tried chmod on this folder and I can't get it to work. (HowTos)