When using the installer, is the Erase Disk option the same as choosing Manual Partitioning option and then making only a single ext4 partition that uses the entire disk space?
This used to be true, but not with the Ubiquity installer in Ubuntu 20.04.
Erase Disk and install creates a MS-DOS partitioned disk (in BIOS mode). Based on the evidence shown below, If you install in BIOS mode, the resulting partitions from this choice have changed in 20.04 from 19.10. Compare Ubuntu 19.10 and recently installed Ubuntu 20.04 (both are VM installs here - but I don't see that making any difference in what the installer does):
Ubuntu 19.10 - how it used to work:
Code:
Disklabel type: dos
Disk identifier: 0xb3867453
Device Boot Start End Sectors Size Id Type
/dev/vda1 * 2048 50329343 50327296 24G 83 Linux
Ubuntu 20.04 - how it works now:
Code:
Disklabel type: dos
Disk identifier: 0x5a8580ee
Device Boot Start End Sectors Size Id Type
/dev/vda1 * 2048 1050623 1048576 512M b W95 FAT32
/dev/vda2 1052670 41940991 40888322 19.5G 5 Extended
/dev/vda5 1052672 41940991 40888320 19.5G 83 Linux
The installer default in 20.04 BIOS install created an EFI system partition and an extended/logical structure for the OS. The EFI partition is empty, but still mounted at /boot/efi.
So based on this evidence, if you want a single partition BIOS system, I suggest you manually partition.
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