Certbot – Attempting to renew cert produced an unexpected error- Ubuntu 20.04

manual-auth-hook command "/etc/letsencrypt/acme-dns-auth.py" returned error code 1
Error output from manual-auth-hook command acme-dns-auth.py:
Traceback (most recent call last):
  File "/etc/letsencrypt/acme-dns-auth.py", line 4, in 
    import requests
  File "/usr/local/lib/python2.7/dist-packages/requests/__init__.py", line 113, in 
    from . import packages
  File "/usr/local/lib/python2.7/dist-packages/requests/packages.py", line 7, in 
    locals()[package] = __import__(package)
ImportError: No module named idna

The issue is caused by the “acme-dns-auth.py” using the wrong version of Python.

First make sure that you have the prerequisite installed:
apt install python3-pip

Open the “acme-dns-auth.py” file and update the first line to look like:
#!/usr/bin/env python3

Now run the renew script
certbot renew


Enable SNMP php 7 Ubuntu

Before you enable SNMP in PHP 7, you first need to make sure that you have the proper SNMP packages installed on the Ubuntu System.

Install the SNMP packages

sudo apt-get install snmpd snmp libsnmp-dev

Before you install the PHP package, make sure you download and install the following package:

apt-get install snmp-mibs-downloader

This package will help translate OIDs into human readable strings

Now you can install the php extension.

apt-get install php-snmp

Then restart the followings:

service snmpd restart
service apache2 restart
Service nginx restart

Install and Manage MIBS file

Linux Command: Tee

“The tee command is normally used to split the output of a program so that it can be both displayed and saved in a file.” wikipedia

tee file.txt

This command create a file.txt and anything you type is : displayed on the screen AND written to the file.

ctrl + z or ctrl + c 

Use this command above to end the session

tee -a file.txt

Same thing as the previous command, except this time it is using the -a (append) flag.

“Note: When tee is used with a pipe, the output of the previous command is written to a temporary file. When that command finishes, tee reads the temporary file, displays the output, and writes it to the file(s) given as command-line argument.” wikipedia

echo "We are YCSoftware" | tee -a file.txt 

The output of the echo command to be written to the file file.txt AND also displayed it on the screen


print_req_error: I/0 error, dev fd0, sector 0

Step 1

let’s list the block devices


if you are not using any floppy disk, there is no reason to have fd0 listed in the output of the command above.

Step 2

rsmod floppy

“rmmod is a simple program which removes (unloads) a module from the Linux kernel.” Now run step 1 again to verify that the fd0 is no longer listed.

Step 3

Run the following command to make the changes permanent

echo "blacklist floppy" | sudo tee /etc/modprobe.d/blacklist-floppy.conf

This command just create a file name blacklist-floppy.conf in the /etc/modprobe.d folder and appends the text “blacklist floppy” to it.

Step 4

The last step is to reconfigure the kernel

dpkg-reconfigure initramfs-tools