I have installed sage-5.10 in my laptop with Ubuntu 13.04. Have being using a worksheet for a while with some calculations. I start my sage worksheet in my terminal changing directory:
cd /home/alien/Desktop/Sage/sage-5.10
then
./sage
then
notebook()
But suddenly when making the cd /home/alien/Desktop/Sage/sage-5.10 I'm getting the message "No such file or directory". So can't start again sage and using my worksheet. How can I solve this problem?.