I have working on the Ubuntu upgrade from 14 to 18.04 ISO. So in my system already having two partitions:
/dev/sda1 Ext4 /
/dev/sda5 swap
I want to be use existing partition (sda1) to install the latest OS 18 without format (format: no, keep existing data) and assign this as mount as root (mount: /)
I need to create the entries in to preseed file as like below configuration (manually select)
Use as : Ext4 jounaling filesystem
Format the partition: no, keep existing data
Mount point: /
Bootable flag: on
Please help on this. i have spent too much time for this.
Note : i can achieve while doing manually select, but i have to done on the unattened ubuntu ISO part.
Thanks,
Ramesh