i’m not much of a hardware guy either. i just find looking through logs interesting. purchasing a pen drive definitely sounds like it will save time 
and headache 
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Wanted to post an update. Tried the in-question 18.04 DVD with another desktop. It got detected and booted into a live session.
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In BIOS I noted that for SATA Operation it is set as AHCI. There is another option which ATA . It has been AHCI all this time. When I tried to change just to test, it warns about OS might not boot and are you sure ?
Should I try ATA and see ?
Also, I found another option. Boot Disable, it is set as Disable.
Hoping these 2 has something to do with DVD boot.
Edit :
BIOS detects SATA ODD as HL -DT -ST DVD ± RW GT50N
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If you set to ATA, some SATA specific things will not work. So if you use an SSD as well, TRIM will stop to work for example. If you change this setting, it will definitely hurt your SSD in long run.
Another problem may arise if your OS on the HDD/SSD is strictly configured to boot from an AHCI device.
For example, you installed Windows 7 in AHCI mode, and later set this ATA-compatibility mode, Windows won’t boot, but gives BSOD bcause of “inaccessible boot device”.
However, there’s not much risk in changing this setting just to see if you can boot from the ODD afterwards? You can safely change it, and evaluate if that setting had any effect regarding ODD boot capability. Just remember to turn it back for everyday use, especially if you use SSD in you system.
That’s quite self explanatory 
I’d try to change this first, before you start to play with the AHCI/ATA game.
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I just wanted to ask.
A technician tried that. When Boot Disable enabled, there is no option other than HDD to choose from.
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