add ubuntu 25.10

active/os_ubuntu/ubuntu-server-25.10.md

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+# Ubuntu Server 25.10
+
+- [Ubuntu Server 25.10](#ubuntu-server-2510)
+  - [Install](#install)
+  - [Automatic Updates](#automatic-updates)
+  - [Disable Swap](#disable-swap)
+  - [Base Software](#base-software)
+  - [Podman](#podman)
+  - [Troubleshooting](#troubleshooting)
+    - [nmcli device unmanaged](#nmcli-device-unmanaged)
+
+Note these instructions differentiate between an `operator` and a `server`. The operator can be
+any machine that configure the server. A pipeline, laptop, dedicated server, etc. are all options.
+The server can be its own operator, though that's not recommended since servers should be ephemeral
+and the operator will store information about each server.
+
+## Install
+
+1. Walk through the normal installation up to disks
+2. Select custom
+3. Select /dev/vda and select use as boot
+4. Select "free space" and create a new gpt ext4 "/boot" partition
+5. Select "free space" and create a new gpt btrfs "/" partition
+6. Continue
+
+## Automatic Updates
+
+On the server:
+
+```bash
+apt install -y unattended-upgrades
+
+systemctl enable --now unattended-upgrades.service
+```
+
+## Disable Swap
+
+```bash
+swapoff -a
+```
+
+## Base Software
+
+On the server:
+
+```bash
+# Install btop for system monitoring
+apt install -y btop net-tools vim tmux cockpit python3-venv python3-pip cifs-utils
+
+# Cockpit
+systemctl enable --now cockpit
+```
+
+## Podman
+
+```bash
+apt install -y podman
+```
+
+## Troubleshooting
+
+### nmcli device unmanaged
+
+Ubuntu installs a config file that sets most devices unmanaged:
+
+/usr/lib/NetworkManager/conf.d/10-globally-managed-devices.conf:
+
+[keyfile]
+unmanaged-devices=*,except:type:wifi,except:type:gsm,except:type:cdma
+
+To disable this, You can create a blank file with the same name in /etc:
+
+sudo touch /etc/NetworkManager/conf.d/10-globally-managed-devices.conf
+sudo systemctl restart NetworkManager
+
+Then `nmcli device set <device-name> managed yes`
+
+Then turn on "Connect Automatically" in Cockpit.