Cannot WGET the images

"C:\Program Files (x86)\GnuWin32\bin\wget" https://system-image.ubports.com//pool/ubports-b2daf85c2a255a0affc93d808e709697e472777de4bc189dd9128211db551469.tar.xz -O pool/ubports-b2daf85c2a255a0affc93d808e709697e472777de4bc189dd9128211db551469.tar.xz && echo "a1a0e2e7d5e2e242b11e7a2fabbabeaaffa7b62fa8b0b014f25b92e0ed888437 pool/ubports-b2daf85c2a255a0affc93d808e709697e472777de4bc189dd9128211db551469.tar.xz" | sha256sum -c --no-check-certificate

SYSTEM_WGETRC = c:/progra~1/wget/etc/wgetrc
syswgetrc = C:\Program Files (x86)\GnuWin32/etc/wgetrc
--2019-03-15 11:35:32-- https://system-image.ubports.com//pool/ubports-b2daf85c2a255a0affc93d808e709697e472777de4bc189dd9128211db551469.tar.xz

Resolving system-image.ubports.com... 104.27.43.113, 104.27.42.113
Connecting to system-image.ubports.com|104.27.43.113|:443... connected.
ERROR: cannot verify system-image.ubports.com's certificate, issued by /C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN=COMODO Domain Validation Legacy Server CA 2': Unable to locally verify the issuer's authority. ERROR: certificate common name ssl388182.cloudflaressl.com' doesn't match requested host name system-image.ubports.com'. To connect to system-image.ubports.com insecurely, use --no-check-certificate'.
Unable to establish SSL connection.

@Lakotaubp Can you explain a little more please in saying that Ubuntu Touch is not a ROM. IIRC, LineageOS, for example, has an Android Custom ROM. I assume that this means that the booloader loads some Android and then the custom ROM?

So in the case of Ubuntu Touch, if you say it is not a ROM, then the bootloader loads the Ubuntu Touch Image directly and does not use any underlying Android components?

I have done plenty of work on Microcomputers (assembler) and Operating Systems. It is just the new terminology associated with Android that is confusing me.

I appreciate your help.

Just recently purchased a Nexus 7 specifically for Ubuntu Touch. Here are the details shown on fastboot

FASTBOOT MODE
PRODUCT NAME - flo
VARIANT - flo 32G
HW VERSION - rev_e
BOOTLOADER VERSION - FLO-04.08
CARRIER INFO - None
SERIAL NUMBER - 000xxxxx
SIGNING - Yes
SECURE BOOT - enabled
LOCK STATE - unlocked

Has anyone else successfully installed Ubuntu Touch on this specific device (with HW VERSION rev_e)?

UBPorts Installer (ubports-installer.0.1.21-beta.exe) never recognizes the device and manually selecting Nexus 7 (wifi) the installer does not proceed past the "Please reboot to bootloader".

ubports/ubports-installer.log says:

{"level":"debug","message":"Welcome to the party","timestamp":"2019-03-08T20:34:31.546Z"}
{"level":"debug","message":"Killing all running adb servers...","timestamp":"2019-03-08T20:34:32.625Z"}
{"level":"debug","message":"Using fallback platform tools!","timestamp":"2019-03-08T20:34:32.853Z"}
{"level":"debug","message":"","timestamp":"2019-03-08T20:34:33.100Z"}
{"level":"debug","message":"","timestamp":"2019-03-08T20:34:33.374Z"}
{"level":"debug","message":"adb shell: echo 1","timestamp":"2019-03-08T20:34:33.650Z"}
{"level":"debug","message":"Successfully downloaded devices list","timestamp":"2019-03-08T20:34:33.913Z"}
{"level":"warn","message":"Running latest stable version.","timestamp":"2019-03-08T20:34:34.299Z"}

"Command failed: ...\Temp\edb02a4d-570a-4d90-b599-a4da912530d9.tmp.exe -P 5038 shell echo 1\n* daemon not running; starting now at tcp:5038\r\n* daemon started successfully\r\nerror: no devices/emulators found\r\n","stack"

Since the installer does not work on either Windows or Linux (I have tried both), where are the ROM zips to manually install?

It is not a good idea to only have the installer option.

I am using a new Nexus 7 2013 (WiFi)
PRODUCT NAME - flo
LOCK STATE - unlocked
which I purchased specifically for Ubuntu Touch.

I have now tried the UBports Installer 0.1.21-beta for Windows (USB cable directly attached to the Nexus 7) and Ubuntu 18.04.2 LTS running in a VirtualBox.

They both do not detect the Nexus 7 despite adb and fastboot correctly interfacing to the Nexus 7.

Is there a debugging log that I can trace what is happening?