Raspberry 4 usbmount not working

I'm using a Raspberry Pi 4 headless with Raspberry Pi OS lite (Debian 10.7). I didn't try too hard making usbmount work, but this alternative works well:

1. Install udevil: sudo apt install udevil
2. Create a systemd service file: sudo nano /etc/systemd/system/devmon.service and write the following:

[Unit]
Description=Automounting usb drives.
After=network.target

[Service]
Type=simple
User=pi
Restart=on-abort
ExecStart=/usr/bin/devmon

[Install]
WantedBy=multi-user.target

4. Enable the service: sudo systemctl enable devmon.service
5. Start the service: sudo systemctl start devmon.service

You can now plug in your USB thumb drive and check that it is mounted using lsblk (it should be mounted in /media/pi/)

I have a Raspberry Pi 4, running Buster, and I successfully installed usbmount following the instructions at ...

https://www.linuxuprising.com/2019/04/automatically-mount-usb-drives-on.html

which in summary says:

sudo apt install git
git clone https://github.com/rbrito/usbmount
sudo apt install debhelper build-essential
cd usbmount
dpkg-buildpackage -us -uc -b

The only change I made was after all those commands and BEFORE installing the .deb file I did this:

sudo apt install lockfile-progs

and then installed like this

cd ..     # back to where you were
sudo dpkg -i usbmount_0.0.24_all.deb 

Because Raspbian is based on Debian, I suggest you to create a permanent system-specific configuration file according to the definitions as given in Debian's policies (see https://www.debian.org/doc/debian-policy/ch-files.html#configuration-files).

Buster has a solid configuration for systemd and udev placed in the package's library files at /lib/systemd/system/systemd-udevd.service. But as opposed to Greg's anwser this is not the place to change the configuration. It's very likely, that the changes you did, will be silently overwritten by an upgrade of the system's packages done by the packet manager. Only files in /etc/systemd/system are meant to be a system-specific configuration change done by an operator and not by a package (for further explanation see https://unix.stackexchange.com/a/458252/85199).

Therefor if you want to make usbmount work again, the already given configuration syntax is right. But you should place it like this.

Create a configuration container directory /etc/systemd/system/systemd-udevd.service.d.

sudo mkdir /etc/systemd/system/systemd-udevd.service.d

Create an own confugration file (that will overwrite the package configuration). Change 00-my-custom-mountflags as you wish.

sudo nano -w /etc/systemd/system/systemd-udevd.service.d/00-my-custom-mountflags.conf

Enter the following configuration, which disables private mounts.

[Service]
PrivateMounts=no

Restart systemd and udev subprocesses (or simply reboot).

sudo systemctl daemon-reexec
sudo service systemd-udevd restart

This way usbmount will work again like expected, your configuration file is persisted and not silently replaced by an apt upgrade.

I've done it this way for Pi 4 B with Raspbian Buster and can confirm that it works.

I faced the same issue with Raspberry Pi 4 and Raspbian Buster, the solution for me was to modify the following file:

/lib/systemd/system/systemd-udevd.service

Before: PrivateMounts=yes

After: PrivateMounts=no

Then I rebooted and it was OK ;)

Please use Greg's solution. I don't know if mods wish to remove this

SO.... I am currently using pmount. Removed USBMOUNT and installed it using the instructions here: https://raspberrypi.stackexchange.com/a/66324/68240 "thanks to the original author btw"

The only extra was that I had to

sudo chmod +x /usr/local/bin/cpmount

Since it was not working at the beginning and before the chmod, I created the mounting folders my self. So I am not sure if you actually need to do that. I also edited the script and changed the folder numbering and finally I removed the --sync setting.

Hope this helps someone, it looks like USBMOUNT is not being developed any more.

Oh oh forgot to mention. I did this before creating the script and right after I installed pmount, so I again I am not sure if it is actually required. Should be though.

sudo pico /etc/pmount.allow

and add there the devices you allow pmount to use /dev/sda1 /dev/sda2 and so on...