How to install and run UNetbootin?

Install UNetbootin in Ubuntu

Using these few commands, downloading and running it will work.

sudo add-apt-repository ppa:gezakovacs/ppa
sudo apt-get update
sudo apt-get install unetbootin

Adding repository is necessary for updates and support for older versions of Ubuntu.

Installing UNetbootin via PPA

sudo add-apt-repository ppa:gezakovacs/ppa
sudo apt-get update
sudo apt-get install unetbootin

Note:
In Ubuntu <18.04, we can directly install UNetbootin with single command

sudo apt-get install unetbootin

But UNetbootin is unavailable from the standard Ubuntu >= 18.04 repositories, due to requiring now-deprecated dependencies (e.g., gksu, kdesudo). The standard UNetbootin PPA, which explicitly supports Ubuntu >= 18.04, should be leveraged instead.

As commented in your question by Web-E , you should just add the executable permission to the file downloaded from SourceForge, then you are able to run it (no installation needed, btw). I had the same problem and that comment gave me the solution, without the need to add the ppa.

If you don't want to use terminal, you can right-click the file unetbootin-linux-585, select "properties", go to "permissions" and then tick "allow execution of the file as a program" (or something like that, i don't have an english-language o.s.).

EDIT:

As suggested in the comment below, here's a little how-to about making a file executable:

To make the file executable via terminal (and we are here supposing you downloaded that file using a browser like Firefox or Opera), you only have to go to the folder where the file resides, right-click on the folder and select "Open terminal here". When you have the terminal shell, don't forget to run

ls -l

to make sure the file is really here, and to check permissions. You should see something like

-rw-r--r-- 1 name name 4478124 lug 11 15:28 unetbootin-linux-585

which means you have to add execution permissions on it. How you do it? Simply typing:

chmod +x unetbootin-linux-585

(don't forget to use Tab to autocomplete the long unetbootin name :P). Now, checking again the file with ls -l should give the following result:

-rwxr-xr-x 1 name name 4478124 lug 11 15:28 unetbootin-linux-585

This means that the program became executable, so just type:

./unetbootin-linux-585

to run the application.

Hope everything is clear.