To virus scan the system, you'd need to boot into windows, turn off any 'fast boot' & cleanly shutdown (so the file system is in a safe/complete state, instead of parts of it stored in cache written in the hibernate/boot file instead of the file system correctly).
Ubuntu releases have a year.month format, so Lubuntu 16.04 LTS means it was the 2016-April release of Lubuntu, which only had three years of supported life, so is no longer supported, no longer gets security updates - as do all flavors of 16.04 LTS except for Kylin. If you want to use 16.04, I'd recommend Ubuntu Server 16.04 LTS (no desktop so won't be suitable), or Ubuntu 16.04 LTS (desktop using Unity 7 desktop), or Ubuntu-Kylin 16.04 LTS - all of which have 5 years of supported life, all other 16.04 flavors are EOL & unsupported.
http://fridge.ubuntu.com/2019/03/01/...-lts-released/
I don't know your device, but 16.04 is rather old (being developed late 2015 & early 2016) so I'd expect better results with a newer OS (eg. Lubuntu 18.04 LTS which is supported until 2021-April (ie. 18.04 + 3 years) let alone having access to newer software, and security updates. Yes a full-disk install (erasing windows) is far easier, but I can appreciate your desire to keep the older-OS door open (it's a lot more work though).
Also ensure you
(a) validated your ISO was flawless -
https://tutorials.ubuntu.com/tutoria...erify-ubuntu#0
(b) your write to install media was perfect -
https://help.ubuntu.com/community/In...IntegrityCheck (where CD refers to CD/DVD/hdd/ssd/thumb-drive/etc)
The Lubuntu manual installation reference is
https://manual.lubuntu.me/stable/1/I...g_lubuntu.html but note it refers to the current stable release (19.10)
https://manual.lubuntu.me/stable/1/1...the_image.html
https://manual.lubuntu.me/stable/1/1...the_image.html
https://manual.lubuntu.me/stable/1/1...tallation.html
which will of course differ for older releases.
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