Now Thats the whole Issue.
You are trying to cd to scanModem.gz which has another name here :
copy of scanModem.gz
Actually you have created a duplicate copy of the same file on your desktop thats why its showing "Copy of ...".
Try to delete any one of them.
It should only display scanModem.gz instead of "Copy of ..."
First perform this and I will let you know whats next to do.