[Bug 1820604] Re: curtin fails to find itself in subiquity snap, when running on serial-subiquity at .service

[Jake Billo]

I also receive the same "Unable to find helpers or 'curtin' exe to add
to path" error as Jim K reported in
https://bugs.launchpad.net/curtin/+bug/1820604/comments/18, after
defining a partition layout in the installer. I am installing on a
Lanner FW-8758 using a Rufus-generated USB stick and have tried both
"ubuntu-18.04.2-live-server-amd64.iso" and "ubuntu-18.04.2-server-
amd64.iso".

I activated the serial console output using similar instructions to
https://github.com/ynkjm/ubuntu-serial-install - mainly adding
"console=tty0 console=ttyS0,115200n8" where necessary.

Unfortunately dropping to shell after the failure occurs won't let me
log in to investigate further, or at least I don't know the appropriate
credentials (root and ubuntu users with a blank password, or the same
username/password result in an authentication failure.)

When installing using VGA mode and without the grub parameters, this
error didn't occur on the same hardware and without having adjusted the
partitions on the SSD.

It'd be great to get an updated install ISO, or at least a workaround
that I could use to pre-prepare a USB stick in case I have to drop back
to using the console port.

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https://bugs.launchpad.net/bugs/1820604

Title:
  curtin fails to find itself in subiquity snap, when running on serial-
  subiquity at .service

Status in curtin:
  Invalid
Status in subiquity:
  Fix Released
Status in livecd-rootfs package in Ubuntu:
  Fix Released
Status in livecd-rootfs source package in Bionic:
  Triaged

Bug description:
  serial-subiquity at .service runs very differently to the tty1 subiquity.

  In seiral-subiquity@ case, it doesn't block starting on snapd as it
  doesn't use /usr/bin/snap run.

  Also, it doesn't execute subiquity.subiquity-service script, meaning
  that PATH setting there is not exported, causing troubles for curtin
  to reexec itself, or to find the right python in $PATH.

  
  Fix that in both livecd-rootfs & subiquity.

  https://github.com/CanonicalLtd/subiquity/pull/428
  https://code.launchpad.net/~xnox/livecd-rootfs/+git/livecd-rootfs/+merge/364888

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