It should be

cd /home/user/MyDocs/.documents

I did not follow the thread, but you have to spell the complete path in order to cd there.

Or another easier way to do, dl to a folder you know, then cd there and run the .deb; for example
dl to /media/mmc1
and cd /media/mmc1
ls to show it is there
and type the file name to execuate the .deb

post back if question

bun
bun