executing grub-install/dev/sda failed

[Victor Loras]

I was trying to do a dual-boot alongside Windows 10, and this error popped. Now, whenever I turn on the pc, the BIOS opens, and neither Windows or Ubuntu gets launched.

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: ubiquity 19.10.21 [modified: lib/partman/automatically_partition/question]
ProcVersionSignature: Ubuntu 5.3.0-18.19-generic 5.3.1
Uname: Linux 5.3.0-18-generic x86_64
ApportVersion: 2.20.11-0ubuntu8
Architecture: amd64
CasperVersion: 1.427
CurrentDesktop: KDE
Date: Fri Mar 27 15:11:28 2020
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/kubuntu.seed maybe-ubiquity quiet splash ---
LiveMediaBuild: Kubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)