Ubuntu

Generic

Timezone

$ timedatectl list-timezones
$ sudo timedatectl set-timezone Asia/Singapore
$ date

How to Fix ‘E: Could not get lock /var/lib/dpkg/lock’ Error in Ubuntu Linux

When trying to install components but saw this: E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), is another process using it?

This may be some apt-get install process is happening:

$ ps aux | grep -i apt
root        7025  0.0  0.0   2608   476 ?        Ss   12:17   0:00 /bin/sh /usr/lib/apt/apt.systemd.daily install
root        7029  0.0  0.0   2608  1656 ?        S    12:17   0:00 /bin/sh /usr/lib/apt/apt.systemd.daily lock_is_held install
bright     12846  0.0  0.0   8156  2580 pts/0    S+   12:20   0:00 grep --color=auto -i ap

Just wait for a couple of minutes, it will be okay after the auto update process is done. To disable the auto update process:

$ sudo vi /etc/apt/apt.conf.d/20auto-upgrades
APT::Periodic::Update-Package-Lists "0";
APT::Periodic::Unattended-Upgrade "0";

Xenial - 16.04 LTS

Enable dual network interfaces for VirtualBox

This setting leads to VMs provisioned on VirtualBox like this:

  • It can ping Internet through NAT from Host laptop;

  • It has a potential static IP if you want

Bionic - 18.04 LTS

Enable dual network interfaces for VirtualBox

Ref: https://linuxconfig.org/how-to-configure-static-ip-address-on-ubuntu-18-04-bionic-beaver-linux

Focal Fossa - 20.04 LTS

Enable dual network interfaces for VirtualBox

This setting leads to VMs provisioned on VirtualBox like this:

  • It can ping Internet through NAT from Host laptop;

  • It has a potential static IP if you want

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