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installing postgresql on ubuntu

Steps for installing postgresql server and make it accessible from remote clients.
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ssh shortcuts ‘bookmark’

How to create a bookmark/shortcut file for ssh.
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Let’s encrypt with vps

How to install “Let’s encrypt” ssl on vps.
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Install tight vnc server

1a. Install desktop environment and vnc server

sudo apt install xfce4 xfce4-goodies tightvncserver

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Launch shell ui with root

Edit the application.desktop file. Change this line from:

Exec=/opt/atom/atom %F

to

Exec=gksudo -k -u root /opt/atom/atom %F

Desktop files are usually located in:

/usr/share/applications/*.desktop

“Quick” compare directory contents

1. Create md5 hash for all files and both directories:

md5deep -r -l aDirectory/* > md5.txt

or for older versions:

hashdeep -c md5 -r -l aDirectory/* > md5.txt

Output between the two are different!

2. Sort both  files:


sort md5.txt > md5_sorted.txt

3. Compare both files:


diff md5_sorted1.txt md5_sorted2.txt

 

Fix eclipse (kepler) ui in linux (mint)

Eclipse looks horrible in Linux.
Apply steps below to make it more appealing … Read the rest of this entry »

Atmega 328p install bootloader with UsbAsp

Quick and easy steps to burn a bootloader

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Fix printing error HP

Error occures when printing:

ERROR:
invalidaccess
OFFENDING COMMAND:
filter
STACK:
/SubFileDecode
endstream

To fix, run:

sudo lpadmin -p <printerName> -o pdftops-renderer-default=pdftops

replace as exactly shown in printers folder/settings.

Ref.: https://bugs.launchpad.net/ubuntu/+source/cups-filters/+bug/998087

Enable beep

Beep has been blacklisted by Ubuntu since …
to restore beep, edit /etc/modprobe.d/blacklist.conf and remove or put it in comment the following line:

blacklist pcspkr

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