Ubuntu
Generic
Timezone
$ timedatectl list-timezones
$ sudo timedatectl set-timezone Asia/Singapore
$ dateHow 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 apJust 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
source /etc/network/interfaces.d/*
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
# which maps to "Host-only adapter"
auto enp0s3
iface enp0s3 inet dhcp
# The secondary network interface
# which maps to "NAT"
auto enp0s8
#iface enp0s8 inet dhcp
iface enp0s8 inet static
address 192.168.56.101
network 192.168.56.0
netmask 255.255.255.0
gateway 192.168.56.1
dns-nameservers 8.8.8.8 192.168.56.1This 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
enp0s3 Link encap:Ethernet HWaddr 08:00:27:d6:00:3d
inet addr:192.168.56.101 Bcast:192.168.56.255 Mask:255.255.255.0
inet6 addr: fe80::a00:27ff:fed6:3d/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:226 errors:0 dropped:0 overruns:0 frame:0
TX packets:170 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:21419 (21.4 KB) TX bytes:21035 (21.0 KB)
enp0s8 Link encap:Ethernet HWaddr 08:00:27:44:a1:a8
inet addr:10.0.3.15 Bcast:10.0.3.255 Mask:255.255.255.0
inet6 addr: fe80::a00:27ff:fe44:a1a8/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:38 errors:0 dropped:0 overruns:0 frame:0
TX packets:61 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:7129 (7.1 KB) TX bytes:5521 (5.5 KB)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
$ cd /etc/netplan/
$ cat 50-cloud-init.yaml
network:
version: 2
ethernets:
enp0s3:
dhcp4: yes
$ sudo vi 50-cloud-init.yaml
network:
version: 2
ethernets:
enp0s3:
dhcp4: yes
enp0s8:
dhcp4: yes
$ sudo netplan apply
$ ifconfig
enp0s3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.56.107 netmask 255.255.255.0 broadcast 192.168.56.255
inet6 fe80::a00:27ff:fe2b:4295 prefixlen 64 scopeid 0x20<link>
ether 08:00:27:2b:42:95 txqueuelen 1000 (Ethernet)
RX packets 64 bytes 10751 (10.7 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 70 bytes 10955 (10.9 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
enp0s8: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.0.3.15 netmask 255.255.255.0 broadcast 10.0.3.255
inet6 fe80::a00:27ff:fe7a:edcf prefixlen 64 scopeid 0x20<link>
ether 08:00:27:7a:ed:cf txqueuelen 1000 (Ethernet)
RX packets 14 bytes 2232 (2.2 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 42 bytes 3868 (3.8 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 1024 bytes 73520 (73.5 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 1024 bytes 73520 (73.5 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0Focal Fossa - 20.04 LTS
Enable dual network interfaces for VirtualBox
$ sudo vi /etc/netplan/00-installer-config.yaml
$ cat /etc/netplan/00-installer-config.yaml
# This is the network config written by 'subiquity'
network:
ethernets:
enp0s3:
dhcp4: true
enp0s8:
dhcp4: true
version: 2
$ sudo netplan tryThis 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
$ ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 08:00:27:4a:d7:4d brd ff:ff:ff:ff:ff:ff
inet 192.168.56.105/24 brd 192.168.56.255 scope global dynamic enp0s3
valid_lft 848sec preferred_lft 848sec
inet6 fe80::a00:27ff:fe4a:d74d/64 scope link
valid_lft forever preferred_lft forever
3: enp0s8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 08:00:27:36:40:11 brd ff:ff:ff:ff:ff:ff
inet 10.0.3.15/24 brd 10.0.3.255 scope global dynamic enp0s8
valid_lft 86048sec preferred_lft 86048sec
inet6 fe80::a00:27ff:fe36:4011/64 scope link
valid_lft forever preferred_lft foreverLast updated
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