my "/" filesystem was filled, hence trying to install ubuntu again in same partition caused halt, stating the problem

[shubham]

my "/" filesystem was filled, hence trying to install ubuntu again in same partition caused halt, stating the problem

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubiquity 2.21.63.4 [modified: lib/partman/automatically_partition/question]
ProcVersionSignature: Ubuntu 4.10.0-28.32~16.04.2-generic 4.10.17
Uname: Linux 4.10.0-28-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
Casper:
 stdin: Not a typewriter
 Generating locales (this might take a while)...
 Generation complete.
 grep: /root/cdrom/preseed/ubuntu.seed: No such file or directory
 pwconv: failed to change the mode of /etc/passwd- to 0600
Date: Wed Apr 25 20:28:25 2018
InstallCmdLine: BOOT_IMAGE=/multibootusb/ubuntu-16.04.3-desktop-amd64/casper/vmlinuz.efi file=/cdrom/preseed/ubuntu.seed boot=casper only-ubiquity iso-scan/filename= quiet splash ignore_bootid live-media-path=/multibootusb/ubuntu-16.04.3-desktop-amd64/casper cdrom-detect/try-usb=true floppy.allowed_drive_mask=0 ignore_uuid root=UUID=EDC9-3B20 ---
ProcEnviron:
 LANGUAGE=en_IN
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_IN
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. A warning message prompted you that this could be a problem and recommended performing a bios mode install instead, but you chose not to. You either need to perform the bios mode install, 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.