FirewallD is not running

Error ini akan muncul saat kita akan melakukan instalasi printer jaringan pada Ubuntu

FirewallD is not running. Network printer detection needs services mdns, ipp, ipp-client and samba client enabled on firewall.

Untuk menyelesaikan masalah ini, melalui Terminal ketikkan:

sudo system-config-printer

LibreOffice Impress Slide Pane can not re-dock

Untuk pengguna LibreOffice Impress, ada sedikit kesulitan saat kesalahan meng-undock slide pane (panel slide: list slide), tidak dapat dikembalikan ke tempatnya semula (re-dock)

Untuk mengembalikan slide pane ke semula, ketik ctrl-shift-F10,
atau tekan ctrl sambil men-double-klik area kosong bagian atas slide pane

Use ctrl-shift-F10 to re-dock your slide pane on Libre Office Impress,
or push ctrl while you double-click the blank area above your slide list at slide pane (see mouse pointer on below image)

Management Asterisk VOIP PABX

when you connect to your installed Asterisk VOIP PABX, use this connection as default:

• user: root
• pass: astlinux

to add new client:

1. goto /etc/asterisk
2. add new client:
1. type: vi /etc/asterisk/sip.conf
2. to know about references about editing using vi, visit http://www.ungerhu.com/jxh/vi.html
3. edit the sip.conf, for adding new client:
• give new caller id as sample :
• [123]               --> the client name
• type=friend     --> this client can use the PABX
• username=123
• secret=123      --> the password
• host=dynamic
• save the sip.conf
3. add new extension for PABX
1. type: vi /etc/asterisk/extensions.conf
2. edit the extensions.conf, follow the last exten noticed there

to use the client:

1. install the VoIP client

2. add the asterisk IP address as gateway

Moving VirtualBox Files to Other Computer/Folder

to move a virtual box file to other folder or computer:

1. find out your virtual box media using:
1. on virtual box: click File - Media Manager
2. you'll find list of (virtual) hardisks used
3. click the (virtual) hardisk that you want to move
4. look at the bottom, note the location of the file
2. copy your file
1. copy/cut virtual box file (file with extension .vdi)
2. paste the file in new folder
3. set virtual box to open the new location
1. open virtual box application
2. click on File - Virtual Media Manager, look at the Hardisk tab
3. if the recent hardisk still exists:
1. right click on the list you want to change the destination
2. click release, answer 'YES' for the confirmation
4. click 'ADD'
5. locate to your .vdi file in your new location
6. exit virtual media manager
7. add your virtual machine
1. in the main display of VirtualBox, click Machine - New
2. click 'NEXT' when welcome screen displayed
3. name your new virtual machine, you can type anything here, and will be displayed on list of virtual machine
4. choose the OS Type and Version related
5. adjust the virtual memory
6. click 'Use existing hardisk', choose your virtual hardisk that has been set in step 3.5
7. click Finish
4. That's all, you can use your virtual machine now

PHPMyAdmin: Cannot start session without errors

sometimes we found this error when logging into PHP MyAdmin:
"Cannot start session without errors, please check errors given in your PHP and/or webserver log file and configure your PHP installation properly."


this because the sessions folder has been removed or restricted, do this steps:
1. check whether the folder /var/lib/php/sessions exists
2. if exists, then you need to run sudo chmod 0777 /var/lib/php/sessions from terminal
3. if the folder doesn't exist, then you need to create the folder manually:
    - cd /var/lib
    - sudo mkdir php
    - sudo chmod 0777 php
    - sudo mkdir sessions
    - sudo chmod 0777 sessions


then try to login via PHP MyAdmin again

VirtualBox can’t operate in VMX root mode. Please disable the KVM kernel extension, recompile your kernel and reboot (VERR_VMX_IN_VMX_ROOT_MODE).

when we start our virtual machine on VirtualBox VMs, if we found this error message:
VirtualBox can’t operate in VMX root mode. Please disable the KVM kernel extension, recompile your kernel and reboot (VERR_VMX_IN_VMX_ROOT_MODE)


do this steps from terminal:
1. sudo lsmod |grep kvm
2. sudo modprobe -r kvm_intel


check whether your virtual machine has normally function

Install eclipse SDK 3.7.1 on Ubuntu

arranged by Oman (from http://www.if-not-true-then-false.com/2010/linux-install-eclipse-on-fedora-centos-red-hat-rhel/)

adopted for Ubuntu

- download eclipse-SDK-3.7.1-linux-gtk.tar.gz

terminal:
>> root mode
sudo -i
>> locate eclipse-SDK-3.7.1-linux-gtk.tar.gz
>> untar SDK on /opt
tar -xvzf eclipse-SDK-3.7.1-linux-gtk.tar.gz -C /opt
>> add permission for /opt/eclipse
chmod -R +r /opt/eclipse
>> create executable file
touch /usr/bin/eclipse
chmod 755 /usr/bin/eclipse
nano -w /usr/bin/eclipse
>> add following to file
#!/bin/sh
export ECLIPSE_HOME="/opt/eclipse"
$ECLIPSE_HOME/eclipse $*
>> create shortcut
>> open shortcut
gedit /usr/share/applications/eclipse.desktop
>> add/replace the existing with following
[Desktop Entry]
Encoding=UTF-8
Name=Eclipse
Comment=Eclipse SDK 3.7.1
Exec=eclipse
Icon=/opt/eclipse/icon.xpm
Terminal=false
Type=Application
Categories=GNOME;Application;Development;
StartupNotify=true

>> call from commandline: eclipse
>> or from desktop shortcut

Instalasi Webserver di Ubuntu

melalui terminal, ketik
sudo apt-get install lamp-server^

kemungkinan Anda akan menemukan masalah:
E: Unable to locate package lamp-server

hal ini dikarenakan kurang lengkap menuliskannya, perhatikan ada tanda topi (^) di ujung, jadi pengetikannya harus lengkap dengan tanda topi:
sudo apt-get install lamp-server^ (DENGAN ^)

-ok-

No USB listed on add printer UBUNTU

If you can't find usb when add device printer, please use:

URI: parallel:/dev/usb/lp0

select proper printer driver, and test the page.

-ok-

Powerpoint error di Linux Ubuntu

Penyelesaian ini untuk pengguna Linux Ubuntu yang masih menggunakan MS Office melalui Wine, dan mendapatkan error:
"Power point failed to start correctly last time....."

Jika ada error saat memanggil MS Powerpoint dari wine Linux Ubuntu, silakan lakukan langkah berikut:

1. Application - Wine - Configure Wine
2. klik tab Libraries
3. pada combo, cari library "riched20" (riched20.dll)
   
4. pilih riched20, klik add
5. rubah override menjadi native (windows)
6. buka lagi MS Powerpoint