Your server is currently running:

✔️ PostgreSQL 14

✔️ TimescaleDB (installed specifically for your OS + PG version)

✔️ Mosquitto setup

✔️ Custom pg_hba.conf

✔️ Tuned postgresql.conf (via timescaledb-tune)

If you run:

do-release-upgrade

This will:

❌ Upgrade the entire OS

❌ Upgrade PostgreSQL major version

❌ Break TimescaleDB (it is very version-specific)

❌ Reset configs

❌ Stop your database and broker

❌ Cause downtime

❌ Risk data corruption

❌ Break your IoT project environment

This is not a safe or simple upgrade.

Ubuntu major release upgrades often break production servers.

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🧠 Important Understanding:

You selected Ubuntu 22.04 LTS — that means:

✔️ Security patches continue until 2027

✔️ It is stable for servers

✔️ TimescaleDB & PostgreSQL versions align

✔️ Perfect for long-term production

Server OS should remain stable for years, unless you rebuild fresh.

IoT platforms rely on stable versions — not bleeding-edge OS upgrades.

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🟢 SO, THE CORRECT ACTION RIGHT NOW:

Ignore this message.

You can safely continue without upgrading.

Later, if you ever want Ubuntu 24.04 LTS:

• You start a fresh VPS
• Migrate database and configs
• Install cleanly

But never upgrade a running production environment in-place.

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✔️ SUMMARY

Upgrade Type	Safe?	Why
apt update	✔️ Yes	Security updates
apt upgrade	✔️ Yes	Safe package updates
do-release-upgrade	❌ No	Major OS upgrade → breaks PostgreSQL & Timescale

✅ 1. Your system is fully updated

You ran:

sudo apt update && sudo apt upgrade -y

The result:

0 upgraded, 0 newly installed, 0 to remove
1 not upgraded (snapd)

This means:

✔️ All normal packages are updated

✔️ No OS upgrade happened

✔️ No PostgreSQL or Timescale changes

✔️ No risk to your server

✔️ You are safe to continue installation

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🧩 2. Why snapd is “kept back”

snapd is the backend for Snap packages.
It is not used by:

• PostgreSQL
• TimescaleDB
• Mosquitto
• Node.js
• Your IoT dashboard

And the “kept back” message simply means:

Snapd wants a dependency that apt will not install automatically.

You don’t need snapd at all.
It is completely safe to ignore this.

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🔥 3. DO NOT run any of these commands:

❌ apt full-upgrade
❌ apt dist-upgrade
❌ do-release-upgrade

These can upgrade:

• Linux kernel
• Systemd
• PostgreSQL version
• TimescaleDB compatibility
• Critical library dependencies

Which can break your working server.