Ubuntu – Page 3 – Puppy Chau

Gtk-WARNING **: Unable to locate theme engine in module_path: “pixmap”

Fix:
sudo apt-get -y install gtk2-engines-pixbuf

[deprecated] Using Oracle’s plugins in Firefox

✎ Last updated on 2018-05-15 at 12:28 EDT

Deprecated post: This post is left here for archival purpose. Beginning in Firefox version 52 released March 7, 2017, installed NPAPI plugins are no longer supported in Firefox.

Enable Oracle’s JRE plugin for Firefox in Linux.

See my other post on Installing Oracle JDK 10.0.1 on Linux.
Create your .mozilla/plugins directory if one isn’t already exists.
```
mkdir ~/.mozilla/plugins
```
Create a symbolic link of the JRE’s libnpjp2.so shared object file in your plugins directory. In my installation, this JRE file is found in /opt/jdk-10.0.1/lib/libnpjp2.so
```
ln -s /opt/jdk-10.0.1/lib/libnpjp2.so ~/.mozilla/plugins 
```
Restart Firefox and browse to one of the JVM tester page to see the version of Java your browser is using.
- Java Tester — javatester.org/version.html
- Java.com — java.com/en/download/testjava.jsp

Installing Virtubox Guest Additions in Ubuntu Guest Machines

Install the needed packages to create kernel modules:

sudo apt-get install dkms build-essential linux-headers-generic

Press the Host+ D key combination or click on the Devices menu and choose the Install Guest Additions… option.
Mount the Guest Additions iso CD image:
```
sudo mount -t iso9660 /dev/cdrom /media/cdrom
```
mount: block device /dev/sr0 is write-protected, mounting read-only

Run the installation script

sudo /media/cdrom/VBoxLinuxAdditions.run

Restart the guest machine.

GDM Disable User List on Login Screen

✎ Last updated on 2011-10-14 at 07:17 EDT

Use the following command:

sudo gconftool-2 --direct --config-source xml:readwrite:/etc/gconf/gconf.xml.defaults -t bool -s /apps/gdm/simple-greeter/disable_user_list true

Setting Static IP of NAT network interface in VirtualBox

As stated in the VirtualBox user manual, section 9.10.1 Configuring the address of a NAT network interface

In NAT mode, the guest network interface is assigned to the IPv4 range 10.0.x.0/24 by default where x corresponds to the instance of the NAT interface +2. So x is 2 when there is only one NAT instance active. In that case the guest is assigned to the address 10.0.2.15, the gateway is set to 10.0.2.2 and the name server can be found at 10.0.2.3.

This means that for Ubuntu, the /etc/network/interfaces entry for the network card settings are something as below:

iface <interface> inet static
    address <static IP> (e.g. 10.0.2.7)
    netmask 255.255.255.0
    network 10.0.2.0
    broadcast 10.0.2.255
    gateway 10.0.2.2

Also, add the following nameserver entry to /etc/resolv.conf

nameserver 10.0.2.3