How to fix fusermount - executable file not found

Quickly fix fusermount: exec: "fusermount": executable file not found in $PATH by installing missing Filesystem in Userspace package.

This is a clear indication of the missing executable.

$ rclone mount gcp: ~/gcp
2019/09/07 19:10:12 Fatal error: failed to mount FUSE fs: fusermount: exec: "fusermount": executable file not found in $PATH

Install Filesystem in Userspace package.

$ sudo apt install fuse
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following NEW packages will be installed:
  fuse
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 72.3 kB of archives.
After this operation, 144 kB of additional disk space will be used.
Get:1 http://deb.debian.org/debian buster/main amd64 fuse amd64 2.9.9-1 [72.3 kB]
Fetched 72.3 kB in 1s (129 kB/s)
Selecting previously unselected package fuse.
(Reading database ... 31948 files and directories currently installed.)
Preparing to unpack .../fuse_2.9.9-1_amd64.deb ...
Unpacking fuse (2.9.9-1) ...
Setting up fuse (2.9.9-1) ...
update-initramfs: deferring update (trigger activated)
Processing triggers for man-db (2.8.5-2) ...
Processing triggers for initramfs-tools (0.133+deb10u1) ...
update-initramfs: Generating /boot/initrd.img-4.19.0-6-amd64

Mount configured remote.

$ rclone mount gcp: ~/gcp

Problem solved.