ubi-partman failed with eñit code 10

[Yaren]

Hi, today i installed ubuntu 20.04. But while installing, as i was at 'Where are you' part, i noticed i didn't choose the right keyboard. So i went back and chamged it Turkish to Turkish Q keyboard, then pressed continue key. but at the page which had normal installation option was, when i pressed continue key i got a notif that the ubi-partman was crashed. I didn't have that problem at first, this happened after i changed my keyboard settings. So i said 'continue anyway' and installed it. I thought i didn't have any problem but it turns out i can't use x key. When i use x, ñ showes up. And for the question mark i type x. I don't know what to do, please help me out. Thanks in advance.
Edit: It's not only keyboard settings by the way, when i try a command in terminal it fails. I am not sure if there's an another problem or problems.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubiquity (not installed)
ProcVersionSignature: Ubuntu 5.4.0-54.60-generic 5.4.65
Uname: Linux 5.4.0-54-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.13
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Thu Nov 26 16:14:31 2020
InstallCmdLine: file=/cdrom/preseed/ubuntu.seed initrd=/casper/initrd quiet splash --- maybe-ubiquity
InstallationDate: Installed on 2020-11-26 (0 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
SourcePackage: ubiquity
Symptom: installation
UpgradeStatus: No upgrade log present (probably fresh install)