Proxy settings are not applied to the installed system

[Paride Legovini]

In the current Focal and Jammy dailies the proxy settings set in subiquity while installing are not applied to the installed system:

 * `apt-config dump Acquire::HTTP::Proxy` is empty
 * /proc/<snapd.service MainPID>/environ has no proxy variables

These are were set in the past, and are expected to be.

Steps to reproduce:

 * Download a recent focal-live-server-amd64.iso
   Last tested with: 20211208
 * Do an "all defaults" install but set a proxy
 * Reboot to the installed system and verify that
   no apt/snap proxy is set.

(Spotted by the ubuntu-focal-live-server-amd64-smoke-proxy Jenkins job)

[Paride Legovini (paride)]

On the installed system /var/lib/cloud/instance/user-data.txt has no proxy settings, so this looks like a subiquity issue to me.

[Dan Bungert (dbungert)]

https://github.com/canonical/subiquity/pull/1141

[Dan Bungert (dbungert)]

@Paride - I was not able to reproduce the snap environment part of this problem. The merged PR includes a fix for the apt proxy setting, which I could reproduce. Do you mind retesting with the next edge build?

[Paride Legovini (paride)]

Thanks! I tried to verify the fix bug edge subiquity looks very broken to me. I refreshed subiquity from edge on a focal-live-server-amd64 image but it crashes at the storage config screen:

Installer debug log: https://paste.ubuntu.com/p/fpvd9JzF5h/

---
ERROR root:39 finish: subiquity/Filesystem/_probe/probe_once: FAIL: [Errno 2] No such file or directory: 'os-prober'
---

os-prober is indeed missing.

I tried the same on Jammy. It doesn't crash, but subiquity gets stuck at the "Installing system" screen, printing no output (see screenshot).

All of this even *without* setting the proxy.

[Paride Legovini (paride)]

(https://github.com/canonical/subiquity/pull/1142/commits/90d764af36c0ff7b511c39d0b1810fbcc659fda6 fixed edge subiquity on Focal.)

I can confirm that edge subiquity correctly applies the proxy settings to the installed system apt and snapd on both Focal and Jammy.

On Jammy subiquity doesn't really get stuck in the "Installing system" view as I reported in my previous comment: the installation proceeds, but nothing is printed in the view (see the sad-subiquity.png screenshot). This isn't spotted by our automated testing (OTOH OpenQA would easily spot the issue). I'm going to file a separate bug for this.

[Paride Legovini (paride)]

Filed: LP: #1953744.

[Dan Bungert (dbungert)]

We believe this bug was resolved in Subiquity 21.12.2. Please reopen if you see otherwise. Thanks!