Raspberry Pi

Problem

You are trying to install uvcdynctrl on Raspberry Pi OS bullseye version using

sudo apt -y install uvcdynctrl

the system can’t find the package:

Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
E: Unable to locate package uvcdynctrl

Solution

The uvcdynctrl package is not available in the standard Raspberry Pi OS repository, but only in the bullseye-backports repository.

In order to solve the problem, activate the backports repository:

Add the following lines at the end of /etc/apt/sources.list:

deb http://deb.debian.org/debian bullseye-backports main contrib non-free
deb-src http://deb.debian.org/debian bullseye-backports main contrib non-free

After that, run

sudo apt update

and finally, try to install uvcdynctrl again:

sudo apt -y install uvcdynctrl

Add the following lines at the end of /etc/apt/sources.list:

deb http://deb.debian.org/debian bullseye-backports main contrib non-free
deb-src http://deb.debian.org/debian bullseye-backports main contrib non-free

After that, run

sudo apt update

The following systemd service will automatically. See this guide for more information on the setup and ensure sudo i2cdetect -y 1 detects the RTC with address 0x68.

This is an automatic service installation & enable script based on A simple systemd service autoinstall script . This script will automatically enable the service on boot:

#!/bin/bash
# This script installs and enables/starts a systemd service
# It also installs the service file
export NAME=ConfigureRTC

cat >/etc/systemd/system/${NAME}.service <<EOF
[Unit]
Description=${NAME}

[Service]
ExecStart=/bin/bash -c 'echo ds1307 0x68 > /sys/class/i2c-adapter/i2c-1/new_device && hwclock -s'
Restart=always

[Install]
WantedBy=multi-user.target
EOF

# Enable and start service
systemctl enable --now ${NAME}.service

This is just the systemd service:

[Unit]
Description=ConfigureRTC

[Service]
ExecStart=/bin/bash -c 'echo ds1307 0x68 > /sys/class/i2c-adapter/i2c-1/new_device && hwclock -s'
Restart=always

[Install]
WantedBy=multi-user.target

Disable NTP:

sudo systemctl disable --now systemd-timesyncd

Enable NTP:

sudo systemctl enable --now systemd-timesyncd

Verifying if NTP is active

You can verify if NTP is active or not by running

timedatectl

Then look for these lines:

System clock synchronized: yes
NTP service: active

System clock synchronized will tell you if the NTP service has successfully synchronized the system time to a NTP time server: yes if synchronized, no if not synchronized.

NTP service will tell you if the NTP service is running, i.e. if it is trying to synchronize the system time to a NTP time server: active if running, inactive when not running

Output with NTP active:

               Local time: Tue 2023-03-14 16:49:28 CET
           Universal time: Tue 2023-03-14 15:49:28 UTC
                 RTC time: Tue 2023-03-14 15:49:28
                Time zone: Europe/Berlin (CET, +0100)
System clock synchronized: yes
              NTP service: active
          RTC in local TZ: no

Output with NTP inactive:

               Local time: Tue 2023-03-14 16:48:01 CET
           Universal time: Tue 2023-03-14 15:48:01 UTC
                 RTC time: Tue 2023-03-14 15:48:01
                Time zone: Europe/Berlin (CET, +0100)
System clock synchronized: no
              NTP service: inactive
          RTC in local TZ: no

First, install samba using

sudo apt -y install samba

then append the following to /etc/samba/smb.conf

[pi]
   comment = pi
   path = /home/pi
   writeable = yes
   browseable = yes
   public = yes
   create mask = 0644
   directory mask = 0755
   force user = pi

and finally restart samba:

sudo systemctl restart smbd

Now your /home/pi will be accessible via SMB (including write access).