Ubuntu can't be installed alongside Linux Mint

[Asztalos Sándor]

the install process crushed
I already instaled, LinMint 17.2 and 19, the instalin process start normaly but it crashed at the half way... I try to do it 3 times and the same result.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubiquity 18.04.14
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CasperVersion: 1.394
Date: Sun Jul 22 17:43:30 2018
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash ---
LiveMediaBuild: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

[Phillip Susi (psusi)]

Your disk is currently partitioned to boot in bios mode, but you booted the installer in EFI mode. You either need to boot the installer in bios mode, or partition the disk using GPT and set up an EFI system partition to install in EFI mode. This will be done for you if you choose the "use entire disk" guided install option.

[Asztalos Sándor (asemtim)]

Thanks for your help, mean time I did a few installations and I choose the
install on the entire disc and after I create 2 more partitions and the
next installation went nicely😎
Now I hawe LinMint 18 / Ubuntu 16 / LinMint 19 on the same HDD and it's OK
I'm happy with this...
The next stage is to install a wirtual machine ... I hope it will be
easier..☺

Thanks again for the hint.

Best Regards

Sandor