Comment 3 for bug 1781015

I tested in a Toshiba laptop from 2013 with Intel i5 (generation 3),

http://www.toshiba.se/laptops/satellite-pro/c850/satellite-pro-c850-19w/

and using the default location (New York and US English)

- in UEFI mode (not secure boot)

- 'Erase disk' (to check with an MSDOS partition table, if Calamares can create an EFI system partition etc). It 'says' that it will create a GPT, an ESP and a root partition ...

Indeed it did that:

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lubuntu@lubuntu:~$ sudo parted /dev/sda p
Model: ATA KINGSTON SUV400S (scsi)
Disk /dev/sda: 120GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags:

Number Start End Size File system Name Flags
 1 2098kB 317MB 315MB fat32 boot, esp
 2 317MB 120GB 120GB ext4

lubuntu@lubuntu:~$
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But when the installer was at 78%, it did not get any further, and the error window appeared.