Actually I've got around this problem by deleting sda5 which was small
swap partition and successfully installed system (after tweaking system
datetime cause without Internet access datetime on server was Jan 2018
and installer complained on invalid Ubuntu certificate and failed).
But I was able to reproduce problem on VirtualBox. Here is steps to do it:
1. Create virtual machine with two disks - on first (20 GB for example) create
msdos partition table (I used gparted from ubuntu-19.10-desktop-amd64.iso) with
1 primary partition (I've created 18.5 GB ext4, it will be sda1) and 1 extended
partition (sda2) consisting of 1 logical partition (e.g. 1.5 GB swap, sda5),
second leave as is (sdb, I've created 10 GB disk).
2. Load VM from ubuntu-18.04.3-live-server-amd64.iso, pass to disk selection,
select entire disk and choose second one (sdb, without partitions), apply
(settings should looke like this https://ibb.co/YZBSMvR), curtin will start to
work and will fail just like on our physical server (https://ibb.co/4f4rJRY,
https://ibb.co/nfQ8S0z).
Attached /var/log/installer/subiquity-curtin-install.conf as Ryan Harper
have asked.
** Attachment added: "subiquity-curtin-install.conf"
https://bugs.launchpad.net/curtin/+bug/1861251/+attachment/5324077/+files/subiquity-curtin-install.conf
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https://bugs.launchpad.net/bugs/1861251
Title:
'extended_part_no' referenced before assignment error during install
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