Ubuntu : Repository URLs for ‘sources.list’ File

Before modifying the sources.list
- create a backup using: sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup

To to change repository sources
- sudo vi /etc/apt/sources.list OR sudo vi /etc/apt/sources.list.d/ubuntu.sources (latest Ubuntu version)

Long-Term Support (LTS) Versions Repo URLs

Ubuntu 24.04 LTS “Noble Numbat”
Types: deb deb-src
URIs: http://us.archive.ubuntu.com/ubuntu/
Suites: noble noble-updates noble-backports noble-proposed
Components: main restricted universe multiverse
Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg
Types: deb deb-src
URIs: http://security.ubuntu.com/ubuntu/
Suites: noble-security
Components: main restricted universe multiverse
Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg

Ubuntu 22.04 LTS “Jammy Jellyfish”
deb http://archive.ubuntu.com/ubuntu/ jammy main restricted universe multiverse
# deb-src http://archive.ubuntu.com/ubuntu/ jammy main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ jammy-updates main restricted universe multiverse
# deb-src http://archive.ubuntu.com/ubuntu/ jammy-updates main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ jammy-security main restricted universe multiverse
# deb-src http://archive.ubuntu.com/ubuntu/ jammy-security main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ jammy-backports main restricted universe multiverse
# deb-src http://archive.ubuntu.com/ubuntu/ jammy-backports main restricted universe multiverse
deb http://archive.canonical.com/ubuntu/ jammy partner
# deb-src http://archive.canonical.com/ubuntu/ jammy partner


Ubuntu 20.04 LTS “Focal Fossa”
deb http://archive.ubuntu.com/ubuntu/ focal main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ focal main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ focal-updates main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ focal-updates main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ focal-security main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ focal-security main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ focal-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ focal-backports main restricted universe multiverse
deb http://archive.canonical.com/ubuntu focal partner
deb-src http://archive.canonical.com/ubuntu focal partner

Ubuntu 18.04 LTS “Bionic Beaver”
deb http://us.archive.ubuntu.com/ubuntu/ bionic main restricted
deb http://us.archive.ubuntu.com/ubuntu/ bionic-updates main restricted
deb http://us.archive.ubuntu.com/ubuntu/ bionic universe
deb http://us.archive.ubuntu.com/ubuntu/ bionic-updates universe
deb http://us.archive.ubuntu.com/ubuntu/ bionic multiverse
deb http://us.archive.ubuntu.com/ubuntu/ bionic-updates multiverse
deb http://us.archive.ubuntu.com/ubuntu/ bionic-backports main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu bionic-security main restricted
deb http://security.ubuntu.com/ubuntu bionic-security universe
deb http://security.ubuntu.com/ubuntu bionic-security multiverse

Ubuntu 16.04 LTS “Xenial Xerus”
deb http://archive.ubuntu.com/ubuntu xenial main
deb http://archive.ubuntu.com/ubuntu xenial-updates main
deb http://archive.ubuntu.com/ubuntu xenial restricted
deb http://archive.ubuntu.com/ubuntu xenial-updates restricted
deb http://archive.ubuntu.com/ubuntu xenial universe
deb http://archive.ubuntu.com/ubuntu xenial-updates universe
deb http://archive.ubuntu.com/ubuntu xenial multiverse
deb http://archive.ubuntu.com/ubuntu xenial-updates multiverse
deb http://archive.ubuntu.com/ubuntu xenial-security main
deb http://archive.ubuntu.com/ubuntu xenial-security restricted
deb http://archive.ubuntu.com/ubuntu xenial-security universe
deb http://archive.ubuntu.com/ubuntu xenial-security multiverse
deb http://archive.ubuntu.com/ubuntu xenial-backports main
deb http://archive.ubuntu.com/ubuntu xenial-backports restricted
deb http://archive.ubuntu.com/ubuntu xenial-backports universe
deb http://archive.ubuntu.com/ubuntu xenial-backports multiverse
deb http://archive.canonical.com/ubuntu xenial partner

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FirewallD: Allow Port or Services

To start / stop firewalld
#systemctl start firewalld OR service firewalld start
#systemctl stop firewalld OR service firewalld stop

1. To allow specific port. Example to allow TCP port 10000, 8080 and 8443

#firewall-cmd --permanent --add-port=10000/tcp
#firewall-cmd --permanent --add-port=8080/tcp
#firewall-cmd --permanent --add-port=8443/tcp
#firewall-cmd --reload

2. To check the port that opened

#firewall-cmd --list-ports

3. To allow spesific service

#firewall-cmd --permanent --add-service=http

4. To check the service that opened

#firewall-cmd --list-services 

5. To allow services / port with spesific IP

#firewall-cmd --new-zone=ftp --permanent
#firewall-cmd --reload
#firewall-cmd --get-zones
#firewall-cmd --zone=ftp --add-source=10.X.X.XX --permanent
#firewall-cmd --zone=ftp --add-port=21/tcp  --permanent
#firewall-cmd --reload

To remove rules

# firewall-cmd --zone=ftp --remove-source=10.X.X.XX --permanent
# firewall-cmd --reload
# firewall-cmd --zone=ftp --remove-port=21/tcp --permanent
# firewall-cmd --reload
# firewall-cmd --permanent --delete-zone=ftp
# firewall-cmd --reload
 

6. Firewalld rich rules

# firewall-cmd --permanent –zone=ftp --add-rich-rule='rule family="ipv4" source address="10.24.96.5/20" port protocol="tcp" port="21" accept'

 

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Linux : Export display over SSH

1. Install Putty & Xming . Then install the application in client desktop.

2. Configuration Putty in client desktop

- access to ssh port

- enable setting in X11. The setting as above.

- after login in to server then type the putty

- then the putty screen will export to client desktop. 

 3. Can export another application GUI from server to client desktop.

 

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