Today I installed a fresh copy of Ubuntu 20.04 (GNU/Linux 5.4.0-1008-raspi aarch64) on my Raspberry PI, and I know that exFAT should be supported by the 5.4 kernel, but whenever I try to mount an external drive, I get an error
$ sudo mount -t exfat /etc/sda1 /media/wd
mount: /media/wd: unknown filesystem type 'exfat'.And here is the output of cat /proc/filesystems
nodev sysfs
nodev tmpfs
nodev bdev
nodev proc
nodev cgroup
nodev cgroup2
nodev cpuset
nodev devtmpfs
nodev configfs
nodev debugfs
nodev tracefs
nodev securityfs
nodev sockfs
nodev bpf
nodev pipefs
nodev ramfs
nodev devpts ext3 ext2 ext4 squashfs vfat
nodev ecryptfs fuseblk
nodev fuse
nodev fusectl
nodev mqueue
nodev pstore btrfs
nodev autofsDo you need to do anything additionally to enable the support for exFAT?
Thank you
96 Answers
Here's something you can try. Since the GNU/Linux 5.4.0-1008-raspi aarch64 kernel doesn't seem to have the support for exFAT built in, you can add it. From you can follow the steps to download and install the exFAT support for the kernel.
Install git if it is not installed:
sudo apt install gitYou may also want the build-essential package:
sudo apt install build-essentialNext, download the exfat-linux:
git clone Enter the newly created folder which should be cd exfat-linux
Then run the following to install the kernel module and make it active:
make
sudo make install
sudo modprobe exfatNow when you run cat /proc/filesystems you should see exfat at the bottom of the list.
The new exFAT kernel driver was in Staging in 5.4 and fully released in 5.7.
See:
I had the same issue after having the fuse drivers installed in an earlier version then upgrading to 20.04 and removing the fuse drivers. cat /proc/filesystems | grep fat does not show exfat.
I re-installed the kernel module included with 20.04 using:sudo modprobe -v exfat
cat /proc/filesystems | grep fat now shows exfat.
Then to make it survive a reboot, I added exfat to /etc/modules-load.d/modules.conf
Here's the fix I found on my amd64 Ubuntu 20.04.
The fuse support gets called first if you have exfat-fuse installed.
- I renamed /sbin/mount.exfat.fuse to /sbin/mount.exfat.fuse-save
- I renamed /sbin/mount.exfat-save to /sbin/mount.exfat-save (so if I screw up I can revert them)
- I checked that exfat.ko existed in /lib/modules/5.4.0-29-generic/kernel/drivers/staging/
- I insmod-ed the exfat.ko (which I found wasn't necessary after the renaming of the mount commands above.
- I called /bin/mount to add the external drive and it mounted.
- I called umount to remove the mounted filesystem.
- I rmmod'd the exfat.ko and checked it just worked without insmod being forced.
- I apt removed exfat-fuse and removed the two saved renamed mount files above since they get called BEFORE the system mount command.
Hope that helps some folks. I think that were all the troubleshooting steps.
Ubuntu should put this in the release notes so others don't have the old fuse-mount versions loading first.
For me I had to run sudo apt install exfat-utils before it stopped being greyed out.
Distilling the above answers to their simplest form, for 20.04:
sudo apt install exfat-utils
sudo apt remove exfat-fuse
sudo mount -t exfat /dev/sde1 /mnt/exfatOf course, mounting by UUID is better than /dev/sdX1 as the names change depending on what's plugged in first.
