I am trying to install fpylll from a repository on Ubuntu 18.04 The fpylll instruction in README.rst says that after Automatic install you should do

$ source ./activate

but I get a notification:

/ bin / sh: 1: source: not found

why it happens? I thought the source is in bash by eliciting? How to solve this problem?

  • @mook765 Help what should I do? What exactly needs to be changed?
    – Dew Debra
    Sep 15, 2021 at 20:25
  • is there a reason why not use sudo apt install python-fpylll
    – user986805
    Sep 15, 2021 at 20:37

1 Answer 1


please replace "source ./activate" with ". ./activate"

see: Bourne shell builtins

good luck.

  • After I ran the command: PYTHON = python3 ./bootstrap.sh I get a notification: Installed /content/fpylll/fpylll-env/lib/python3.7/site-packages/fpylll-0.5.6-py3.7-linux-x86_64.egg Processing dependencies for fpylll==0.5.6 Finished processing dependencies for fpylll==0.5.6 Don't forget to activate environment each time:
    – Dew Debra
    Sep 15, 2021 at 21:39
  • Then, as you wrote, I ran the command: ./activate As a result, nothing was displayed in the terminal. Then I ran my script and got notifications that the module is missing: Traceback (most recent call last): File "script.py", line 35, in <module> from fpylll import LLL, BKZ, IntegerMatrix ModuleNotFoundError: No module named 'fpylll'
    – Dew Debra
    Sep 15, 2021 at 21:44
  • I have Ubuntu 18.04 but the script needs to be run on Python3. From the [documentation] (ubuntu.pkgs.org/21.04/ubuntu-universe-amd64/…), this only works on Ubuntu 21.04. Then I decided to install fpylll via repositories. But don’t know what the problem is?
    – Dew Debra
    Sep 15, 2021 at 21:50
  • hi @DewDebra. Activate only sets enviroment variables to point to the Libs and bootstrap.sh is a shell script. Take a look at github.com/fplll/fpylll/blob/master/bootstrap.sh on lines 33-39 and 50-55. Those lines set enviroment variables.
    – jpbrain
    Sep 15, 2021 at 22:08
  • So you need to set your enviroment correctly to be able to run it. what do you get with "env" and "env python" commands.
    – jpbrain
    Sep 15, 2021 at 22:09

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