Download it.

"https://packages.ubuntu.com/bionic/all/python-future/download"

"sudo dpkg -i python-future_0.15.2-4ubuntu2_all.deb"

I ran this command, found on web to install python-future, as the apt install command was unable to locate package python-future.

rabbit@ganymede:~$ pip install future
Defaulting to user installation because normal site-packages is not writeable
Requirement already satisfied: future in /usr/lib/python3/dist-packages (0.18.2)
WARNING: You are using pip version 20.2.4; however, version 21.0.1 is available.
You should consider upgrading via the '/usr/bin/python3 -m pip install --upgrade pip' command.

I ran the two commands you specified. The output is attached. In the syslog file, the first 3 lines are unplug, the rest are due to replugging in the FTDI cable. Here seems to be the pertinent line from syslog;

Apr  7 15:06:08 ganymede ModemManager[1098]: <info>  Couldn't check support for device '/sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.1/1-1.1.3': not supported by any plugin

Not sure what move to make now.

Kindly,
Robert