I am wondering how to resize my manjaro partition on a dual Boot system with gparted ?
It is not possible for me to resize because unllocatetd storage is not detected. I am not able to create it as partition. Do I need to change partition table before being able to use the unllocated storage ?
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You can’t resize a partition you are already booted into. Use a live usb session and gparted to resize your manjaro partition but best to make a backup just incase
Anyway, extending a lvm partition is beyond my payroll, moving that partition should not be a big deal but it could affect the booting process without further action.
That’s because you have already four primary partitions, which is the maximum for a msdos parted disk like yours. Please, explain the purpose of /dev/sda4. You boot in BIOS mode with a msdos parted disk so there is no need for a /boot/efi partition.
If your conclusion is that you don’t need this partition, delete it and then you can create a new fourth primary partition - or you can create an extended partition to carry many more logical partitions inside (preferable). This would allow you to add more than one partition, e.g. if you intend to use a /home or /swap partition.
When you install later-on Manjaro, make sure to boot the USB stick with the live ISO in BIOS mode, don’t choose the UEFI entry from your firmware when booting.