I've recently dualbooted ubuntu on my computer, it didn't work well I believe, could we check that togethere ?

[Guillaume Manderscheid]

I have a rog computer and followed tutorials in order to make dualbooting work but had some issues. Some things were missing, i believe that I didn't use the good flash drive or key, could we check together what is going on ? :/

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: ubiquity 18.10.12
ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12
Uname: Linux 4.18.0-10-generic x86_64
ApportVersion: 2.20.10-0ubuntu13
Architecture: amd64
CasperVersion: 1.399
Date: Tue Feb 5 07:39:20 2019
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash ---
LiveMediaBuild: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)