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# switch to superuser mode
sudo -s
# add the repository key for uv4l
curl http://www.linux-projects.org/listing/uv4l_repo/lpkey.asc | sudo apt-key add 
# add the url for the u4vl repository to apt
echo "deb http://www.linux-projects.org/listing/uv4l_repo/raspbian/stretch stretch main" >> /etc/apt/sources.list
apt-get update
apt-get install uv4l uv4l-raspicam
apt-get install uv4l-raspicam-extras
reboot

In my case things didn't work out of the box I checked that the server is running with:

but still no server running on port 8080 or elswhere ... please stay tuned

# switch to superuser mode
sudo -s
# add the repository key for uv4l
curl http://www.linux-projects.org/listing/uv4l_repo/lpkey.asc | sudo apt-key add 
# add the url for the u4vl repository to apt
echo "deb http://www.linux-projects.org/listing/uv4l_repo/raspbian/stretch stretch main" >> /etc/apt/sources.list
apt-get update
apt-get install uv4l uv4l-raspicam
apt-get install uv4l-raspicam-extras
# do not forget to install the server - see what happens if you do
# below
apt-get install uv4l-server
reboot

In my case things didn't work out of the box (if forgot to install the uv4l-server ...). The following comments might help you debug similar problems.

I checked that the server is running with:

but still no server running on port 8080 or elswhere. So it seems i forgot the "--foreground" option which the man page states is necessary:

sudo uv4l --sched-rr --mem-lock --driver raspicam --encoding mjpeg --enable-server=required --foreground
<notice> [core] Trying to loading driver 'raspicam' from built-in drivers...
<notice> [core] Loading driver 'raspicam' from external plug-in's...
<notice> [driver] Dual Raspicam & TC358743 Video4Linux2 Driver v1.9.63 built Oct  6 2018
<notice> [driver] Detected camera imx219, 3280x2464
<notice> [driver] Selected format: 1920x1080, encoding: mjpeg, JPEG Video Capture
<notice> [driver] Framerate max. 30 fps
<notice> [core] Device detected!
<notice> [core] Trying to load the the Streaming Server plug-in...
<warning> [core] libserver.so: cannot open shared object file: No such file or directory
<alert> [core] No Streaming Server detected

Now that's a clear hint! There seems to be no server yet - so install it:

sudo apt-get install uv4l-server

and try again:

sudo uv4l --sched-rr --mem-lock --driver raspicam --encoding mjpeg --enable-server=required --foreground
<notice> [core] Trying to loading driver 'raspicam' from built-in drivers...
<notice> [core] Loading driver 'raspicam' from external plug-in's...
<notice> [driver] Dual Raspicam & TC358743 Video4Linux2 Driver v1.9.63 built Oct  6 2018
<notice> [driver] Detected camera imx219, 3280x2464
<notice> [driver] Selected format: 1920x1080, encoding: mjpeg, JPEG Video Capture
<notice> [driver] Framerate max. 30 fps
<notice> [core] Device detected!
<notice> [core] Trying to load the the Streaming Server plug-in...
<notice> [server] HTTP/HTTPS Streaming & WebRTC Signalling Server v1.1.125 built on Mar  9 2019
<warning> [server] SSL is not enabled for the Streaming Server. Using unsecure HTTP.
<notice> [core] Streaming Server loaded!
<notice> [core] Registering device node /dev/uv4l
<notice> [server] Web Streaming Server listening on port 8080

The server is now available at http://pi:8080 (replace pi with your server's ip or hostname)

After a reboot it worked with out entering another command.

But still the server didn't start automatically - please stay tuned ...

But still the server didn't start automatically ...

man uv4l

then showed me the option

--enable-server [=arg(=required)] (=auto)
          enable the streaming server. Possible values are: 'auto' (tenta‐
          tively start the server), 'required' (exit if failing  to  start
          the  server,  only  works if --foreground is enabled), 'off' (no
          server at all).

so I tried:

pkill uv4l
sudo uv4l --sched-rr --mem-lock --driver raspicam --encoding mjpeg --enable-server=required
<notice> [core] Trying to loading driver 'raspicam' from built-in drivers...
<notice> [core] Loading driver 'raspicam' from external plug-in's...
<notice> [driver] Dual Raspicam & TC358743 Video4Linux2 Driver v1.9.63 built Oct  6 2018
<notice> [driver] Detected camera imx219, 3280x2464
<notice> [driver] Selected format: 1920x1080, encoding: mjpeg, JPEG Video Capture
<notice> [driver] Framerate max. 30 fps
<notice> [core] Device detected!
<notice> [core] Registering device node /dev/uv4l

but still no server running on port 8080 or elswhere ... please stay tuned

Piotr Kula's answer seems to be on the right track but is outdated for Raspberry stretch.

There are updated instructions for uv4l on Raspberry stretch at

https://www.linux-projects.org/uv4l/installation/

# switch to superuser mode
sudo -s
# add the repository key for uv4l
curl http://www.linux-projects.org/listing/uv4l_repo/lpkey.asc | sudo apt-key add 
# add the url for the u4vl repository to apt
echo "deb http://www.linux-projects.org/listing/uv4l_repo/raspbian/stretch stretch main" >> /etc/apt/sources.list
apt-get update
apt-get install uv4l uv4l-raspicam
apt-get install uv4l-raspicam-extras
reboot

You can tweek the uv4l options via /etc/uv4l/uv4l-raspicam.conf and then restart the service with

service uv4l_raspicam restart

Piotr Kula's answer seems to be on the right track but is outdated for Raspberry stretch.

There are updated instructions for uv4l on Raspberry stretch at

https://www.linux-projects.org/uv4l/installation/

# switch to superuser mode
sudo -s
# add the repository key for uv4l
curl http://www.linux-projects.org/listing/uv4l_repo/lpkey.asc | sudo apt-key add 
# add the url for the u4vl repository to apt
echo "deb http://www.linux-projects.org/listing/uv4l_repo/raspbian/stretch stretch main" >> /etc/apt/sources.list
apt-get update
apt-get install uv4l uv4l-raspicam
apt-get install uv4l-raspicam-extras
reboot

You can tweek the uv4l options via /etc/uv4l/uv4l-raspicam.conf and then restart the service with

sudo service uv4l_raspicam restart

In my case things didn't work out of the box I checked that the server is running with:

pgrep -fla uv4l
995 /usr/bin/uv4l -f -k --sched-fifo --mem-lock --config-file=/etc/uv4l/uv4l-raspicam.conf --driver raspicam --driver-config-file=/etc/uv4l/uv4l-raspicam.conf --server-option=--editable-config-file=/etc/uv4l/uv4l-raspicam.conf

and whether it listened with

sudo netstat -tulpn 

but there was no entry for uv4l in the list. I had expected one for port 8080

so i tried the command from How to configure UV4L?

uv4l --sched-rr --mem-lock --driver raspicam \
> --width 960 --height 540 --framerate 30 \
> --encoding mjpeg --vflip --hflip
<notice> [core] Trying to loading driver 'raspicam' from built-in drivers...
<notice> [core] Loading driver 'raspicam' from external plug-in's...
<notice> [driver] Dual Raspicam & TC358743 Video4Linux2 Driver v1.9.63 built Oct  6 2018
<notice> [driver] Detected camera imx219, 3280x2464
<notice> [driver] Selected format: 960x544, encoding: mjpeg, JPEG Video Capture
<notice> [driver] Framerate max. 30 fps
<notice> [core] Device detected!
<notice> [core] Registering device node /dev/uv4l

But still the server didn't start automatically - please stay tuned ...