Changing Software Sources in Ubuntu 20.04
By default, the default software repository links of Ubuntu are located overseas, resluting in slow download speeds. It is necessary to switch to domestic software sources.
Open the software source configuratino file with vi
The sources.list file stores the software source configurations.
vi /etc/apt/sources.list
Add software source links
Aliy ...
Posted on Sat, 18 Jul 2026 16:30:43 +0000 by dakkonz
Essential Linux CLI Shortcuts and Debian Package Management
Terminal Interaction and Directory Navigation
Adjusting the terminal font size can be done quickly using Ctrl + Shift + +.
To toggle between the current working directory and the previous one, use cd -. For instance, if you navigate from /var/log to /etc/nginx using cd /etc/nginx, running cd - will instantly return you to /var/log. Executing it ...
Posted on Thu, 11 Jun 2026 18:08:52 +0000 by mickd
Fixing APT Dynamic MMap Exhaustion in Ubuntu Jammy on FreeBSD Jail
An apt update or apt full-upgrade inside an Ubuntu Jammy installation running under FreeBSD jail may abort with:
E: Dynamic MMap ran out of room. Please increase the size of APT::Cache-Start. Current value: 25165824. (man 5 apt.conf)
E: Dynamic MMap ran out of room. Please increase the size of APT::Cache-Start. Current value: 25165824. (man 5 a ...
Posted on Thu, 14 May 2026 11:02:41 +0000 by Grant Cooper
Configuring Domestic Mirrors for Ubuntu ARM Systems
Ubuntu ARM systems utilize a distinct repository named ubuntu-ports instead of the standard Ubuntu repositories. This guide demonstrates how to configure domestic mirror sources for improved downlaod speeds on ARM-based Ubuntu installations.
Understanding Ubuntu ARM Repositories
ARM architecture Ubuntu systems require the ubuntu-ports repositor ...
Posted on Mon, 11 May 2026 02:11:48 +0000 by Mightywayne