I cant install some app from snapd help!

error: cannot communicate with server: Post “http://localhost/v2/snaps”: dial unix /run/snapd.socket: connect: no such file or directory

systemctl status snapd.service
● snapd.service - Snap Daemon
Loaded: loaded (/lib/systemd/system/snapd.service; disabled; vendor preset: disabled)
Active: inactive (dead)
TriggeredBy: ● snapd.socket

● snapd.socket - Socket activation for snappy daemon
Loaded: loaded (/lib/systemd/system/snapd.socket; disabled; vendor preset: disabled)
Active: inactive (dead)
Triggers: ● snapd.service
Listen: /run/snapd.socket (Stream)
/run/snapd-snap.socket (Stream)

It looks like your distro is using presets to disable systemd services by default (as indicated by the vendor preset: disabled part of the output).

You can probably get things running by executing the following:

sudo systemctl enable snapd.socket
sudo systemctl start snapd.socket

That should get things working, and make sure it sticks for the next boot.

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error: too early for operation, device not yet seeded or device model not acknowledged

What is snap changes ?

that message could really use a “(please try again later)” appended or some such …