# Booting Linux on KD240 - Known Issues

1. Sometimes, Ubuntu has a background process ongoing by the time it boots to command prompt and does not yet ask you to change the password. In such cases, doing a snap install might result in a message similar to the following:

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

   Try again in a minute or two, and you should be prompted to update the password and above error should disappear.

2. If a prompt similar to the following appears:

   ![kernel](./media/kernelflash.png)

   Choose **keep the local version currently installed**. For more details, refer to [this wiki page](https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/2116354051/Tips+Tricks+for+Certified+Ubuntu+AMD-Xilinx+Devices#Understanding-the-Configuring-flash-kernel-Prompts-When-Updating-the-Linux-Kernel).

3. During the ```sudo xlnx-config.sysinit``` or ```sudo apt upgrade``` commands, you might see the following errors and exit installation. Rerun the commands, and the installation should continue and complete.

   ``` text
   flash-kernel: deferring update (trigger activated)
   /etc/kernel/postinst.d/zz-flash-kernel:
   flash-kernel: deferring update (trigger activated)
   Errors were encountered while processing:
   flash-kernel
   need restart is being skipped since dpkg has failed
   E: Sub-process /usr/bin/dpkg returned an error code (1)
   ```

4. As of Ubuntu 22.04 and Yocto 2024.1, the Linux image (Ubuntu or Yocto generated wic image) for KD240 is unique for KD240 only. It can not be used with KR260 or KV260.

## Miscellaneous Information

The *ubuntu* user does not have root privileges. Most commands used in the tutorials must be run using *sudo*, and you might be prompted to enter your password.

For security, by default, the root user is disabled. If you want to login as a root user, perform the following steps. Use the *ubuntu* user's password on the first password prompt, then set a new password for the root user. You can now login as a root user using the newly set root user password.

```bash
ubuntu@kria:\~\$ sudo -i
sudo\] password for ubuntu:
root@kria:\~#
```

If needed, the following commands are used to set the System Timezone and locale:

* Set timezone:

   ```bash
   sudo timedatectl set-ntp true
   sudo timedatectl set-timezone America/Los_Angeles
   timedatectl
   ```

* Set locale:

   ```bash
   sudo locale-gen en_US en_US.UTF-8
   sudo update-locale LC_ALL=en_US.UTF-8 LANG=en_US.UTF-8
   export LANG=en_US.UTF-8
   locale
   ```

The following example command sets the date and time:

`sudo date --set "11 January 2023 16:47:00"`

The storage volume on the SD card can be limited with multiple Dockers. If there are space issues, use the following command to remove the existing container.

```bash
sudo docker rmi --force $INSTALLED_DOCKER_IMAGE
```

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