You'll have to write the ISO to USB. They have a tutorial here: https://tutorials.ubuntu.com/tutorial/tutorial-create-a-usb-stick-on-windows#0

Can you use drive droid to store the extracted ubuntu on a thumb drive? Or do you have to connect the phone to the computer?

In that case your phone pretends to be a (bootable) USB stick. To me that's all overly complicated and cumbersome compared to just using a USB drive or DVD, but to each their own. ;-)

Never mind about drive droid. It requires root, which I.won't do.
The problem is creating the extracted ISO. Why don't they just let me download the extracted version? Is it poasible to create the extracted ISO on android?

Some tools let you install a clean fresh native Linux environment, under Windows or DOS.
But I "guess" DriveDroid is not that powerful.

The most easily way would to use a USB drive/pendisk to install Linux.
Yon can setup dual-boot more easier this way.

You can extract the files in the ISO easily with any number of tools, but then it wouldn't boot. Just download Rufus to write the ISO to USB like explained in the tutorial I linked.

Personally I was never a fan of Ubuntu in the past, mainly because of some wrong decisions they made and besides of that, Mint just did it better. However, Ubuntu nowadays is a much better distro and it's a good all-round distro, I prefer the Mate version as it's my favorite desktop. I own multiple systems at home, the majority are running Mint, 1 running Ubuntu 17.10 and another laptop running Debian 9.

As for your Kaspersky question, Linux as a system in general has very few viruses and I mean very, compared to Windows. In fact you'll find that most Linux users don't even bother with an Antivirus, most software on Linux is quality over quantity, open source and therefor safe from malicious code. However should you still want an Antivirus there's ClamAV and most distros come with a Firewall.

Won't work on android. Dont have window or mac.

I just installed "Terminal Emulator for Android" from F-Droid and it looks like some basic form of dd is provided by my phone's busybox. However, that's probably a bit too advanced and I'm not sure if it'd actually work. Still, as a final resort it might be worth.

The Android app ISO 2 USB looks more promising. I haven't tried it, but it looks like given an ISO file and USB drive it should be able to do the job.

Just don't believe what they say about linux & security.

Open source is as vulnerable as anything, and nobody reads the code for real. Everyone just pretends than someone else must've made it secure because hey it's open source and anybody could do it right?

It takes a fiasco like Heartbleed for people to actually start paying attention, and then they find out the code they've been relying on for the past 20 years is pretty friggin terrible.

And on the other hand, CVEs are being reported against open source software all the time. Statistically, the bugs are aplenty. How long they've gone unnoticed, or how long they've been privately known (and perhaps exploited) is a different matter.

It's true that there's not much malware targetting Linux desktop users, simply because there are so few of them (and quite a few of them are rather tech savvy and don't run all the crap that *somehow* just got downloaded when they visited some random porn shite on the web, or received as an attachment from some rich dude in Nigeria). (On the other hand, exploits targetting Linux servers & vulnerable wordpress etc. installations are a dime a dozen)

If 90% of the world's desktops & workstations were suddenly switched to Linux, we'd see a massive influx of malware.

It's also worth pointing out that e.g. Microsoft has deployed many exploit mitigations long before they became mainstream on Linux. They might have existed in grsecurity patches or some otherwise hardened distros, but were not adopted for a long long time..

It turns out that real security is very hard to find in the consumer & business space. And nothing will help against stupid users who insist on using terrible passwords and installing & running all the crap they come across.

I'd say take a look at OpenBSD -- I love it -- but even there's a ton of low-hanging fruit. It's not a high assurance system.

Sometimes stupid scripts also do more harm than malware.
An infamous bug was that bumblebee erase everything in /usr.
It is like erasing everying in Program Files in Windows.

OpenBSD is secure enough by default, but not suitable for gaming.

Personally, I recommend Linux Mint - I even wrote a beginner's guide for it :) At its core it basically *is* Ubuntu (it uses the same package base and repositories as Ubuntu, as well as its own) so just about everything that works for Ubuntu will work for Mint, but with a different (and better IMO) desktop environment & other improvements to make it a lot easier to set up and use. Very easy since it's the most widely used and supported desktop distro, and the vast majority of developers target it. Plus both GOG and Steam officially support Ubuntu/Ubuntu-based distros.

For Office suites, there's LibreOffice which is included as standard or you can install OpenOffice if you'd prefer that. There's also WPS Office, but I don't have much experience with that. It's not something I've really had to pay that much attention to as the built-in firewall is sufficient for my needs, but I'm sure others here can provide information about your options in this regard.

Not taking any sides here, since I use both Linux and Windows, but the above is not exactly exclusive to Linux.

For example, the unpatched Pool of Radiance 2: Ruins of Myth Drannor would remove several system files when uninstalled. Normally, barring any nasty software bugs, doing the same thing in Linux would require elevated permissions -- at least newer versions of Windows have moved on from the old ones in that respect.

Basically, anything can go wrong on any operating system, given the right circumstances.

I am reminded of the following bug:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=155873

(I believe the package in question no longer exists, though according to the bug report, the bug was fixed the same day.)

(I was able to find this bug because of a spelling error in the title. Reminds me of the error message "segmentation faulty tree", which was sort of an accident (and doesn't occur unless something is corrupted so it's rare to see that message), but because the error message was so distinctive, it is easy to find it via a google search. Sometimes, unique error messages (but make sure they're not misleading or offensive) can be a good thing.)

What exactly is the difference in just copying an ISO file to a USB and "burning" and ISO file to usb?