It looks like there is a confusion in udev/Polkit policies.
Is it a clean installation ? Or upgrades over upgrades ?
Code: Select all
grep -r ^d /etc/apt/sources*
uname -a
Did you install some non default special mounting/unmouting tools ?
How is your DVD-rom player detected ? Visible in lsusb or lspci ?
For investigation, you can see what happen when you plug your Flash drive with this
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$ udevadm monitor --environment --udev
# journalctl | tail
# dmesg | tail
Remark on:
hack3rcon wrote:I plugged the USB drive then Debian can't mount it automatically [
Nothing wrong here. By default, a Flash drive should be detected with an icon visible in a file manager, but not mounted.