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On Ubuntu 19.04 and all its official flavors I observed that if I boot the LiveUSB in UEFI mode, there are options for live session and installation with safe graphics written beside them. However these options aren't available in legacy mode.

enter image description here

So, what is the purpose of this safe graphics mode? Is there any specific reason why they included in 19.04 and not on previous releases such as 16.04, 18.04 and 18.10?

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+50

While @marosg answer is excellent, I just want to add..

nomodeset parameter is highly in use since the previous releases and lot of people are looking for a workaround or solution in the web while their first attempt failed due to graphics problem..

While there are answers how to edit the kernel parameter while booting the Live USB.

With the addition of this boot entry, it gives the user a fast way to try Ubuntu/ Install Ubuntu here onwards..

As I have tried to view the parameters for these new entries...
it just added nomodeset no other parameters other than default.

Please have a look on below images..

Try Ubuntu without Installing enter image description here

Try Ubuntu without Installing (safe Graphics) enter image description here

Install Ubuntu enter image description here

Install Ubuntu (safe Graphics) enter image description here

Here are few links to previous Questions about nomodeset.

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Special reason why they include it is called progress :) There are cases when system cannot correctly initialize graphics card and after boot you get just a black screen. Safe graphics mode sets boot parameters the way which allow to boot and be able to login and correct things. If it works ok it will be probably included in later releases as well.

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