Android Studio 1.5
Build #AI-141.2422023, built on November 12, 2015
I just updated my Android Studio on Ubuntu 15.10 when it gave me the prompt that a new version is available. After the patch download was finished, I chose the option to use my previous Android Studio settings when it asked for the prompt. But after that it is giving me the cannot resolve symbol ... error everywhere in the project and also showing me the pop-up warning
System Health
IBus prior to 1.5.11 may cause input problems. See IDEA-78860 for details.
I have tried cleaning and rebuilding the project. But nothing is working. What do I do? Please Help.
Thank you.
When IDEA is used on a system with IBus is installed and running keyboard input sometimes became blocked by IBus daemon. Event Dispatching Thread is active. All other events are delivered in order - i.e. it is possible to select text or call menu actions by a mouse.
Solution: Either upgrade IBus to version 1.5.11 or add "export IBUS_ENABLE_SYNC_MODE=1" to your ~/.profile, then restart a session.
Alternatively, you can turn off IBus at System Settings | Language Support | Keyboard input method.
IDEA 15 will show a warning if an incompatible version of IBus is in use.
checkout this link for detals https://youtrack.jetbrains.com/issue/IDEA-78860
来源：https://stackoverflow.com/questions/33823742/android-studio-ibus-prior-to-1-5-11-may-cause-input-problems-see-idea-78860-f