Error(s) while installing Android Studio using umake

Seems you have a missing GPG key for the required package(s).

You are seeing this issue because apt cannot find a matching GPG key for the required package(s) installed on your system (maybe ubuntu-make ppa added correctly, but an error occurred when adding signing key¿?).

As a personal advice, i would consider always first using the default software channels, and only add a ppa if there is any special requirement(s) which default software doesn't cover.

Adding/retrieving GPG key(s) from keyserver.ubuntu.com

You can check if that certain GPG key exist in keyserver.ubuntu.com and automatically add it to your system. To do this simply run this on your terminal:

sudo apt-key adv --keyserver ha.pool.sks-keyservers.net --recv-keys 1BE1E8D7A2B5E9D5

If the key exists, it will be added to your system and you'll be able to install ubuntu-make with sudo apt install ubuntu-make.

Reverting your system (removing the ppa)

If no packages were installed/changed, you can simply remove the ppa (repo) file and entry from apt sources, running the following command on your terminal:

sudo rm /etc/apt/sources.list.d/ubuntu-desktop-ubuntu-ubuntu-make-xenial.list*

However I'll always suggest best using ppa-purge (you can install it with sudo apt install ppa-purge), which in addition to remove the sources entry, it also removes the added keys and does all other genuflections, like reverting packages to their equivalent on the main repos (if any were installed).

Run this on your terminal to remove and purge ubuntu-make ppa using ppa-purge:

sudo ppa-purge ppa:ubuntu-desktop/ubuntu-make

Tip: You can use bash autocompletion with Tab to fill ppa name.

Hope it helps.