1. IBus
a. reboot ibus:
killall ibus-daemon ibus-daemon -d
b. set ibus default start:
just set int Systen->Administration->Language Support->Keyboard input method system = ibus
2.Thunderbird
a. add Thunderbird to notification area
sudo touch /usr/share/indicators/messages/applications/thunderbird sudo gedit /usr/share/indicators/messages/applications/thunderbird
then add following line
/usr/share/applications/thunderbird.desktop
finally, log out and log in, or try
killall gnome-panel
3. svn
a. Fixing ‘SSL handshake failed: SSL error: Key usage violation in certificate has been detected.’ error on SVN checkout
sudo apt-get install libneon27 sudo mv /usr/lib/libneon-gnutls.so.27 /usr/lib/libneon-gnutls.so.27.old sudo ln -s /usr/lib/libneon.so.27 /usr/lib/libneon-gnutls.so.27
4. PPA keys
a. behind a firewall and can not access the keyserver: force to port 80
gpg --keyserver hkp://keyserver.ubuntu.com:80 --recv-key 51716619E084DAB9 gpg -a --export 51716619E084DAB9 | sudo apt-key add -
5.PDF files
a. compress pdf file size
gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/screen -dNOPAUSE -dQUIET -dBATCH -sOutputFile=output.pdf input.pdf