Category: Ubuntu – Page 3

Install VirtualBox 6.1 on Ubuntu 18.04

Posted on July 26, 2020 by ServerOk

First you need to add VirtualBox repository

sudo echo "deb [arch=amd64] https://download.virtualbox.org/virtualbox/debian bionic contrib" > /etc/apt/sources.list.d/virtualbox.list

1	sudo echo "deb [arch=amd64] https://download.virtualbox.org/virtualbox/debian bionic contrib" > /etc/apt/sources.list.d/virtualbox.list

Add Keys

wget -q https://www.virtualbox.org/download/oracle_vbox_2016.asc -O- | sudo apt-key add -
wget -q https://www.virtualbox.org/download/oracle_vbox.asc -O- | sudo apt-key add -

1 2	wget -q https://www.virtualbox.org/download/oracle_vbox_2016.asc -O- \| sudo apt-key add - wget -q https://www.virtualbox.org/download/oracle_vbox.asc -O- \| sudo apt-key add -

Do an apt upgrade

sudo apt-get update

1	sudo apt-get update

If you have older version of VirtualBox installed, remove it

sudo apt remove virtualbox virtualbox-dkms virtualbox-qt

1	sudo apt remove virtualbox virtualbox-dkms virtualbox-qt

Install VirtualBox 6.1 with

sudo apt-get install virtualbox-6.1

1	sudo apt-get install virtualbox-6.1

If you use Vagrant, you may need to install latest version as the vagrant provided by ubuntu won’t work with VirtualBox 6.1 […]

Ubuntu Screen Recorder

Posted on May 27, 2020 (December 1, 2020) by ServerOk

Ubuntu come with screen recorder, this can be activated with shortcut

CTRL + ALT + SHIFT + R

1	CTRL + ALT + SHIFT + R

By default, it will record for 30 seconds. Video get saved in your home directory (/home/USERNAME) in webm format. If you want to increase time, you can run following command

gsettings set org.gnome.settings-daemon.plugins.media-keys max-screencast-length  TIME_IN_SECONDS_HERE

1	gsettings set org.gnome.settings-daemon.plugins.media-keys max-screencast-length TIME_IN_SECONDS_HERE

It is better to set this to 0, this way record never […]

Install LAMP Server on Ubuntu/Debian

Posted on April 12, 2020 by ServerOk

To install LAMP (Apache, MySQL, PHP) on Ubuntu/Debian web server, run

apt-get install lamp-server^

1	apt-get install lamp-server^

This use meta package install LAMP. If you want to remove, don’t remove the meta package as it will remove many other required packages. You need to remove packages one by one. Related Posts Apache MySQL […]

Uninstall Time Doctor on Ubuntu

Posted on January 27, 2020 (January 28, 2020) by ServerOk

Time Doctor is an application to track time. To uninstall Time Doctor on Ubuntu, run

sudo /bin/bash -c 'apt purge sfproc; /bin/bash /opt/sfproc/uninstall'

1	sudo /bin/bash -c 'apt purge sfproc; /bin/bash /opt/sfproc/uninstall'

Time doctor run following process

root@pc8:~# ps aux | grep sfp
root      7884  0.0  0.1  72848  4316 pts/1    S    09:53   0:00 sudo -H -u training /bin/bash -l -c export DISPLAY=:0; export XAUTHORITY=/run/user/1004/gdm/Xauthority; export DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1004/bus,guid=be774defc4c97a1711ff06305e2fb38d; export TD_DEVELOPER=; export XDG_CURRENT_DESKTOP=ubuntu:GNOME; export XDG_SESSION_DESKTOP=ubuntu; export XDG_SESSION_ID=2; cd /home/training; /opt/sfproc/SF/sfproc/3.0.64/sfproc &> /dev/null
training  7889  0.0  0.0  19992  3148 pts/1    S    09:53   0:00 /bin/bash -l -c export DISPLAY=:0; export XAUTHORITY=/run/user/1004/gdm/Xauthority; export DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1004/bus,guid=be774defc4c97a1711ff06305e2fb38d; export TD_DEVELOPER=; export XDG_CURRENT_DESKTOP=ubuntu:GNOME; export XDG_SESSION_DESKTOP=ubuntu; export XDG_SESSION_ID=2; cd /home/training; /opt/sfproc/SF/sfproc/3.0.64/sfproc &> /dev/null
training  7893  4.4  1.2 1407988 51724 pts/1   SLl  09:53   0:00 /opt/sfproc/SF/sfproc/3.0.64/sfproc
root      7947  0.0  0.0  21536   976 pts/1    S+   09:54   0:00 grep --color=auto sfp
root@pc8:~#

root@pc8:~# ps aux | grep sfp

root 7884 0.0 0.1 72848 4316 pts/1 S 09:53 0:00 sudo -H -u training /bin/bash -l -c export DISPLAY=:0; export XAUTHORITY=/run/user/1004/gdm/Xauthority; export DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1004/bus,guid=be774defc4c97a1711ff06305e2fb38d; export TD_DEVELOPER=; export XDG_CURRENT_DESKTOP=ubuntu:GNOME; export XDG_SESSION_DESKTOP=ubuntu; export XDG_SESSION_ID=2; cd /home/training; /opt/sfproc/SF/sfproc/3.0.64/sfproc &> /dev/null

training 7889 0.0 0.0 19992 3148 pts/1 S 09:53 0:00 /bin/bash -l -c export DISPLAY=:0; export XAUTHORITY=/run/user/1004/gdm/Xauthority; export DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1004/bus,guid=be774defc4c97a1711ff06305e2fb38d; export TD_DEVELOPER=; export XDG_CURRENT_DESKTOP=ubuntu:GNOME; export XDG_SESSION_DESKTOP=ubuntu; export XDG_SESSION_ID=2; cd /home/training; /opt/sfproc/SF/sfproc/3.0.64/sfproc &> /dev/null

training 7893 4.4 1.2 1407988 51724 pts/1 SLl 09:53 0:00 /opt/sfproc/SF/sfproc/3.0.64/sfproc

root 7947 0.0 0.0 21536 976 pts/1 S+ 09:54 0:00 grep --color=auto sfp

root@pc8:~#

[…]

netplan

Posted on January 15, 2020 (January 16, 2021) by ServerOk

Ubuntu Server 20.04 set static IP with netplan Ubuntu Server 20.04 configure OVH failover IP […]

Ubuntu 18.04 MariaDB 10.2 Too many open files

Posted on December 13, 2019 by ServerOk

On my computer running Ubuntu 18.04, MriaDB stopped working. PHP application i run on my computer failed with error

SQLSTATE[42S02]: Base table or view not found: 1146 Table 'ok_test.feeds' doesn't exist (SQL: select * from `feeds` where `processed` = 0)

1	SQLSTATE[42S02]: Base table or view not found: 1146 Table 'ok_test.feeds' doesn't exist (SQL: select * from `feeds` where `processed` = 0)

Application can’t find the table. So i tried to login to MySQL and see if table is there or not. But i get error

boby@sok-01:~$ mysql
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 2504
Server version: 10.2.30-MariaDB-1:10.2.30+maria~bionic-log mariadb.org binary distribution

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> show databases;
ERROR 1018 (HY000): Can't read dir of '.' (errno: 24 "Too many open files")
MariaDB [(none)]>

boby@sok-01:~$ mysql

Welcome to the MariaDB monitor. Commands end with ; or \g.

Your MariaDB connection id is 2504

Server version: 10.2.30-MariaDB-1:10.2.30+maria~bionic-log mariadb.org binary distribution

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> show databases;

ERROR 1018 (HY000): Can't read dir of '.' (errno: 24 "Too many open files")

MariaDB [(none)]>

Next i checked if this is due to any MySQL […]

Disable Native Notification on Google Chrome Ubuntu

Posted on November 8, 2019 (November 8, 2019) by ServerOk

On Ubuntu, Google chrome had a disable native notification option. On Chrome 78, this option is removed. But you still can manually enable it. To enbale chrome notification, edit file

gedit ~/.config/google-chrome/Local\ State

1	gedit ~/.config/google-chrome/Local\ State

Find

"tab-hover-cards@4"

1	"[email protected]"

Replace with

"enable-native-notifications@2","tab-hover-cards@4"

1	"[email protected]","[email protected]"

Save and exit the file. Now restart google chrome. Related Posts Google Chrome […]

Install NextCloud Desktop client on Ubuntu

Posted on September 28, 2019 by ServerOk

To install NextCloud desktop client on Ubuntu, add PPA

sudo add-apt-repository ppa:nextcloud-devs/client
sudo apt-get update

1 2	sudo add-apt-repository ppa:nextcloud-devs/client sudo apt-get update

Now run

sudo apt install nextcloud-client

1	sudo apt install nextcloud-client

After install, start nextcloud client, you will be able to login with nextcloud server URL, user and password. […]

Linux KVM Bridge network on Ubuntu

Posted on September 17, 2019 (August 4, 2020) by ServerOk

On Ubuntu 18.04 server, first i get Ubuntu to use /etc/network/interface, by default Ubuntu 18.04 and newer use netplan. First install ifdown

apt install ifupdown -y

1	apt install ifupdown -y

Install bridge utils and resolvconf.

apt install bridge-utils resolvconf

1	apt install bridge-utils resolvconf

Now you can configure your network interface by editing file

vi  /etc/network/interface

1	vi /etc/network/interface

Here is my network configuration on an OVH server.

root@ns3048991:~# cat /etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)
# Include files from /etc/network/interfaces.d:
source-directory /etc/network/interfaces.d

auto eno3
iface eno3 inet static
    address 149.202.199.137
    netmask 255.255.255.255
    broadcast 149.202.199.137
    gateway 149.202.199.254
    dns-nameservers 8.8.8.8 8.8.4.4
root@ns3048991:~#

root@ns3048991:~# cat /etc/network/interfaces

# interfaces(5) file used by ifup(8) and ifdown(8)

# Include files from /etc/network/interfaces.d:

source-directory /etc/network/interfaces.d

auto eno3

iface eno3 inet static

address 149.202.199.137

netmask 255.255.255.255

broadcast 149.202.199.137

gateway 149.202.199.254

dns-nameservers 8.8.8.8 8.8.4.4

root@ns3048991:~#

To convert this interface to […]

Install Xfce VNC remote desktop on Ubuntu

Posted on September 17, 2019 by ServerOk

XFCE is a light weight desktop for Linux. XFCE + vnc allow you to setup remote desktop on a VPS or dedicated server located on a data center or cloud. You can connect to remote desktop using VNC client and work like it is local computer. To instal XFCE run

apt install -y xfce4 xfce4-goodies

1	apt install -y xfce4 xfce4-goodies

Next install vncserver

apt install -y vnc4server

1	apt install -y vnc4server

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