cannot install system snap "snapd"

[Matthias Mailänder]

Trying to test https://github.com/snapcrafters/eclipse/pull/70 locally fails:

snapcraft
failed to inject host's snap 'snapcraft' into target environment.nstance from remote
* Command that failed: 'lxc --project snapcraft exec local:base-instance-snapcraft-buildd-base-v7-c-f91ee4af44ccdf02cefb -- env CRAFT_MANAGED_MODE=1 DEBIAN_FRONTEND=noninteractive DEBCONF_NONINTERACTIVE_SEEN=true DEBIAN_PRIORITY=critical snap install /tmp/snapcraft.snap --classic'
* Command exit code: 1
* Command standard error output: b'error: cannot perform the following tasks:\n- Ensure prerequisites for "snapcraft" are available (cannot install system snap "snapd": Post "https://api.snapcraft.io/v2/snaps/refresh": net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers))\n'
Full execution log: '/home/matthias/.local/state/snapcraft/log/snapcraft-20240613-140205.076032.log'

I tried removing and reinstalling snapcraft, but it did not help.

I am running KUbuntu 24.04

[Callahan Kovacs (mr-cal)]

I haven't seen this timeout before. It's possible it's a transient network/server issue and may be worth retrying in a few hours.

If not, what happens if you launch a lxc container and try to install snapd yourself?

i.e.

lxc launch ubuntu:24.04 u1
lxc exec u1 bash
snap install snapd # or 'snap refresh snapd --channel=latest/beta' to force it to grab something from the snapstore

[Matthias Mailänder (mailaender)]

lxc launch ubuntu:24.04 ul
lxc exec ul bash
root@ul:~# snap install snapd
error: unable to contact snap store

[Matthias Mailänder (mailaender)]

root@ul:~# ping snapcraft.io
PING snapcraft.io (185.125.190.29) 56(84) bytes of data.
--- snapcraft.io ping statistics ---
4 packets transmitted, 0 received, 100% packet loss, time 3077ms

[Maciej Borzecki (maciek-borzecki)]

Is there a proxy configured in your environment?

[Matthias Mailänder (mailaender)]

Software firewall is disabled and no proxy used. The connection problems only happen in lxc.

[Callahan Kovacs (mr-cal)]

1. Are you using a VPN?
2. Can you reach other websites besides snapcraft.io from the lxc container?

[Matthias Mailänder (mailaender)]

Not using a VPN. The lxc container can't reach anything.

[Callahan Kovacs (mr-cal)]

Ah, OK. So this is a broader lxc-related network issue and not a snapcraft-specific issue.

Do you have Docker installed? This is another common reason for not having network connectivity in LXC containers:

https://documentation.ubuntu.com/lxd/en/latest/howto/network_bridge_firewalld/#prevent-connectivity-issues-with-lxd-and-docker

[Matthias Mailänder (mailaender)]

Yes, Docker installed.

docker --version
Docker version 26.1.4, build 5650f9b

[Callahan Kovacs (mr-cal)]

That is the most likely cause then. The link provided above has steps to resolve LXD network issues when Docker is installed.