** Description changed:
### Description
- When installing Ubuntu (26.04 and 26.10) inside a Virtual Machine with
- the Network Interface Card (NIC) disabled during installation, powering
- off the VM, cloning it, and subsequently turning on the NIC in the clone
- results in a system where internet connectivity does not connect
- automatically at boot.
+ When installing Ubuntu (versions 26.04 and 26.10) inside a Virtual
+ Machine with the Network Interface Card (NIC) disabled during
+ installation, powering off the VM, cloning it, and subsequently turning
+ on the NIC in the clone results in a system where internet connectivity
+ does not initialize automatically at boot.
- In contrast, Ubuntu MATE 26.10 handles this scenario correctly, and
+ In contrast, **Ubuntu MATE 26.10 handles this scenario correctly**, and
internet connectivity works out of the box when the NIC is enabled on
- the clone.
+ the clone, even though its default configuration
+ (`/etc/netplan/00-installer-config.yaml`) does not explicitly contain a
+ `dhcp4` directive and looks like this:
+
+ ```yaml
+ # This is the network config written by 'subiquity'
+ network:
+ ethernets: {}
+ version: 2
+
+ ```
---
### Steps to Reproduce
1. Create a Virtual Machine with the NIC disabled or disconnected.
2. Complete the installation of Ubuntu 26.04 or 26.10 inside the VM.
3. Power off the Virtual Machine and create a clone of it.
4. Enable the NIC on the cloned VM, then power it on.
5. Check if internet connectivity connects automatically at boot.
---
### Expected Result
Internet connectivity should connect automatically at boot once the NIC
is turned on in the cloned VM, consistent with the behavior observed in
Ubuntu MATE.
---
### Actual Result
Internet connectivity does not connect automatically at boot when booted
- with the NIC enabled.
+ with the NIC enabled on standard Ubuntu installations.
---
### Additional Information / Workaround
- This issue does not occur in Ubuntu MATE 26.10.
+ Unlike standard Ubuntu, Ubuntu MATE 26.10 works seamlessly out of the
+ box regardless of whether the NIC was on or off during installation,
+ without requiring manual Netplan adjustments.
- As a temporary workaround, the following script can be used to resolve
- the issue:
+ As a temporary workaround for standard Ubuntu installations, the
+ following script can be used to resolve the issue:
```bash
if grep -q '^ID=ubuntu' /etc/os-release && \
- grep -q '^VERSION_ID="26\.' /etc/os-release && \
- grep -Eq '^Ubuntu [0-9]' /var/log/installer/media-info 2>/dev/null; then
- IFACE=$(ip -4 route show default | awk '{print $5}' | head -n1)
- [ -z "$IFACE" ] && IFACE="enp1s0"
+ grep -q '^VERSION_ID="26\.' /etc/os-release && \
+ grep -Eq '^Ubuntu [0-9]' /var/log/installer/media-info 2>/dev/null; then
+ IFACE=$(ip -4 route show default | awk '{print $5}' | head -n1)
+ [ -z "$IFACE" ] && IFACE="enp1s0"
- # Check if DHCP is already configured
- DHCP4_SET=$(netplan get ethernets."$IFACE".dhcp4 2>/dev/null)
- DHCP6_SET=$(netplan get ethernets."$IFACE".dhcp6 2>/dev/null)
+ # Check if DHCP is already configured
+ DHCP4_SET=$(netplan get ethernets."$IFACE".dhcp4 2>/dev/null)
+ DHCP6_SET=$(netplan get ethernets."$IFACE".dhcp6 2>/dev/null)
- if [ "$DHCP4_SET" != "true" ] || [ "$DHCP6_SET" != "true" ]; then
- sudo netplan set ethernets."$IFACE".dhcp4=true
- sudo netplan set ethernets."$IFACE".dhcp6=true
- sudo netplan generate
- sudo netplan apply
+ if [ "$DHCP4_SET" != "true" ] || [ "$DHCP6_SET" != "true" ]; then
+ sudo netplan set ethernets."$IFACE".dhcp4=true
+ sudo netplan set ethernets."$IFACE".dhcp6=true
+ sudo netplan generate
+ sudo netplan apply
- # Wait for WAN and DNS so premature apt runs don't fail InRelease
checks
- until wget -q --spider --timeout=1 http://archive.ubuntu.com; do
- sleep 1
- done
- fi
+ # Wait for WAN and DNS so premature apt runs don't fail InRelease
checks
+ until wget -q --spider --timeout=1 http://archive.ubuntu.com; do
+ sleep 1
+ done
+ fi
- sudo apt-get update
+ sudo apt-get update
fi
```
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https://bugs.launchpad.net/bugs/2170258
Title:
Netplan fails to configure DHCP on first boot when installed with NIC
disabled then enabled
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