Thanks for your response. It seems that you really think it is related to the SD card. That being said, on the same page you mentioned, they also say that disk utility is fine to format a card with a mac...

I will try the SD formatter anyway and if it doesn't work, buy a new SD card...

Thanks!

Hi everyone! I had a perfectly working raspberry pi for a week until I decided to do the sudo apt-get update and sudo apt-get upgrade for the first time. The update part was fine but I got an error on the upgrade part opening some package. After trying few options (none of them worked), I decided to...