Category Archives: troubleshooting

Configuring proxy for APT in Ubuntu

Recently, I have a problem where when I tried to update Ubuntu package via apt-get, it shows HTTP 401 proxy error related.
Just a note, I’m running the VM using my office network which has a proxy servers.

From this site;

APT configuration file method
This method uses the apt.conf file which is found in your /etc/apt/ directory. This method is useful if you only want apt-get (and not other applications) to use a http-proxy permanently.
On some installations there will be no apt-conf file set up. This procedure will either edit an existing apt-conf file or create a new apt-conf file.
gksudo gedit /etc/apt/apt.conf
Add this line to your /etc/apt/apt.conf file (substitute your details for yourproxyaddress and proxyport).
Acquire::http::Proxy “http://username:[email protected]:proxyport”;
Save the apt.conf file.

References :

Fixing wp_termmeta doesnโ€™t exist error

One day, I open my mailbox and see bunch of error mail written something like this:

Upon diving in Google ocean, I found this solution that may solve the problem:

Use this SQL query to add manually the wp_termmeta table in your WordPress database if there is the wp_termmeta table doesnโ€™t exist in your DB.


Shell script fails: Syntax error: โ€œ(โ€ unexpected

The error when executing the bash code:

The script does not begin with a shebang line, so the kernel executes it with /bin/sh. On Ubuntu, /bin/sh is dash, a shell designed for fast startup and execution with only standard features. When dash reaches the line, it sees a syntax error: that parenthesis doesn’t mean anything to it in context.

Since dash (like all other shells) is an interpreter, it won’t complain until the execution reaches the problematic line. So even if the script successfully started at some point in your testing, it would have aborted once the problematic line was reached.

The shebang line must be the very first thing in the file. Since you use bash features, the first line of the file must be #!/bin/bash or #!/usr/bin/env bash.


Python Error – InsecurePlatformWarning

There is one time I see this kind of error:

If you’re on ubuntu, you may run into trouble installing pyopenssl, you’ll need these dependencies:

You only need to install the security package extras:

or, install them directly:

Requests will then automatically inject pyopenssl into urllib3


Python Error – ImportError: No module named pkg_resources

There is one time I tried to install some python package via pip install requirement. But I encountered some error like this:

To fix the issue, run the setup script for setuptools:

Yeah. it solve my problem. Probably. XD


Fix Locale problem on Ubuntu

Recently, I saw this kind or error quite frequent. At first I thought that it was nothing.
But eventually, it’s kinda bothering me when I see the error message. :p

So, here is the solution to solve this problem.
First, run this command:

It updates /etc/default/locale with provided values.

If you see the /etc/default/locale file, it shows something like this:

If the problem still occur, maybe you can try this first before running the command above again:

Credit to

SNMP Cannot Find Module on Ubuntu 14.04

If you encounter error something like this:

Then, where are in the same path. Path where we searching for the answers. XD
So, here is the solution to solve this error.

First, edit this sources.list file:

add this line to the end of file:

:w to save and :q to exit vi editor

Then, install this packages:

And then run this:

Voila! Done. Hope it helps. ๐Ÿ™‚

Ubuntu – Authentication token manipulation error

Authentication token manipulation error on Ubuntu

Authentication token manipulation error on Ubuntu

Recently, I forgot my “root” password for my Ubuntu (duh!). So I try attempting to change my “root” password by selecting recovery mode on the grub menu and dropped into a root shell prompt.

Everything works perfect until I try to change the password. The picture above is what I get when i try to change the password. ๐Ÿ™

So, to solve this, just run this on the prompt:

Anddddd… Walla! Try to reset the password again and it works! ๐Ÿ™‚

Hash sum mismatch error on Ubuntu

I think most of you will encounter with this kind of problem if you are using the previous version of Ubuntu.

The solution is to remove the content of /var/lib/apt/lists directory:

then run:

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