Generally this error is caused by Etcher not having root access in the tmp folder - make sure sudo is installed and configure Etcher to have root access - you can right click the Etcher AppImage and select properties then make sure the check is in the block "allow this file to run as a program" make sure the Owner and Group have read and write access
Just so you are aware - Debian does Not like to include proprietary, closed source, non-free software in it's distribution. The lack of Wi-fi drivers may be just the tip of the iceberg. Which is 'O.K.' - if you are willing to wrestle with your installation to get everything working. Otherwise a distro which includes "non-free" software ( drivers, etc. ) may be more desirable.I'm in no way well-versed in Linux (it's a learning WIP)
If I were you I'd find someone you know and download either Linux Lite or Linux Mint and create a bootable usb.I'm in no way well-versed in Linux (it's a learning WIP) but am familiar with a few terminal commands, such as apt-get and so on.
Been downloading, installing and playing with different flavours of Linux to see which one fit me. Started with Ubuntu; went on to Mint, Kali, Zorin, and now Debian. Debian for some odd reason is the only 1 I've used so far that doesn't automatically come with internet drivers.
I went to the main page for Linux Lite and I wasn't able to find a 32-bit .iso.
I did however; find a 32-bit .iso for Linux Mint 18.
Here's more 32-bit versions of Linux Mint 20:
I found Tricia Linux mint by myself.
Am torrenting it as we speak.