Unable to install latest Dolphin App on Ubuntu

[Liquidpaper]

In brief:

I downloaded dolphin-master-4.0-9215_amd64.deb

Tried opening it in software center but received

Code:

Dependency is not satisfiable: libavcodec56(>=6.11~beta1)|libavcodec-extra-56 (>=6:11.2)

as an error.

I then tried to install by calling upon it in the terminal like this

Code:

sudo dpkg -i dolphin-master-4.0-9215_amd64.deb

and received this

Code:

dpkg: error processing archive dolphin-master-4.0-9215_amd64.deb (--install):
cannot access archive: No such file or directory
Errors were encountered while processing:
dolphin-master-4.0-9215_amd64.deb

as the output.

Please let me know if you have any insight and/or haven't provided all of the necessary information, thank you.

[Helios]

first do

sudo apt-get purge dolphin*

to start with a clean slate.

Then follow the directions here

https://wiki.dolphin-emu.org/index.php?title=Installing_Dolphin#Ubuntu