I am having an issue moving .zip file from Ubuntu Download to SD device (USB adapter to SD) - do not have a permission to do that.

1. What permission ?
2. Can I download direct to SD device ?

Use sudo to make a download directory on the SD device. Then, use chown to change ownership to yourself. Then you can download to that directory

would be nice to explain exactly what did you try and what's happened. We can hardly guess the error message you got.

On Linux systems, a normal user should not have write (copy) permissions to much of anything outside that user specific /home directory. The reason for that is that Linux is designed as a multi-user system. Whether you have more than one user on your machine or more, it's still the same. The chown command suggested above should do the job for you. If you don't understand it, you can do an online search for using chown on Linux or post back if you don't understand. Your profile indicate Ubuntu so if that is the case, I would suggest you familiarize yourself with the sudo command used by Ubuntu at the link below.

https://help.ubuntu.com/community/RootSudo

It also depends on which file system the user uses. and how the device was mounted. (another proof that automounters do not work, or not easy enough to use for the casual who is not interested in learning the basics about computers)

i agree the basics are needed and binary distros are bad. binary distros do not educate users on permissions, mounting, using the shell

basically this topic is about the first pages of any linux book which starts with the shell and covers the basics, and i have read sevearl in the past

or e.g. the gentoo handbook and doing once the full gentoo installation should cover this too in my point of view