Unable to reinstall Ubuntu. Want to downgrade to 18.04.2

[Eric Dylan Hensler]

My OS seems to be, for lack of a better way of putting it, "disintegrating." Every ten minutes, something else "fails." I am trying to do a clean install of 18.04.2, despite the fact that I was running 18.10, but I cannot get my system to boot from USB and I do not have blank DVDs to make a bootable one. I have tried F12, F10, F2 and every combination thereof over the last several hours and, occasionally I get a long flurry of tiny white print on a black screen with the word "failed" appearing frequently but it's too fast for me to read. When it comes to a stop, it is prompting me to enter my p/w. When I do, the system boots more or less as normal. However, when I try to update or upgrade I get a message that some file or other is "badly corrupted" or something like that and I must use the RESUME something to get it to do something or other. I have only been only Linux for less than 2 weeks and I haven't the faintest idea what is going on. I really need help. I have backed up everything and just want to completely reinstall from the ground up but cannot.

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: ubuntu-release-upgrader-core 1:18.10.11.5
ProcVersionSignature: Ubuntu 4.18.0-17.18-generic 4.18.20
Uname: Linux 4.18.0-17-generic x86_64
ApportVersion: 2.20.10-0ubuntu13.2
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Fri Mar 22 19:41:03 2019
InstallationDate: Installed on 2019-02-23 (27 days ago)
InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
Symptom: ubuntu-release-upgrader
UpgradeStatus: Upgraded to cosmic on 2019-03-14 (8 days ago)
VarLogDistupgradeTermlog:

modified.conffile..etc.default.apport:
 # set this to 0 to disable apport, or to 1 to enable it
 # you can temporarily override this with
 # sudo service apport start force_start=1
 enabled=0
mtime.conffile..etc.default.apport: 2019-03-08T05:25:07.116686

[Brian Murray (brian-murray)]

Thank you for taking the time to report this issue and helping to make Ubuntu better. Examining the information you have given us, this does not appear to be a bug report so we are closing it and converting it to a question in the support tracker. We understand the difficulties you are facing, but it is better to raise problems you are having in the support tracker at https://answers.launchpad.net/ubuntu if you are uncertain if they are bugs. You can also find help posting your problem in the support forum of your local Ubuntu's community http://loco.ubuntu.com/ or asking at http://askubuntu.com. For help on reporting bugs, see https://help.ubuntu.com/community/ReportingBugs.