Mupen64Plus v1.99.4 for Ubuntu is released. Mupen64Plus is a N64 emulator and plugins for Linux, Mac OSX, and FreeBSD. Mupen64Plus is a plugin-based N64 emulator for Linux which is capable of accurately playing many games. Included are four MIPS R4300 CPU emulators, with dynamic recompilers for 32-bit x86 and 64-bit amd64 systems, and necessary plugins for audio, graphical rendering (RDP), signal co-processor (RSP), and input. There are 3 OpenGL video plugins included: glN64, RiceVideoLinux, and Glide64.

Mupen64Plus Features:
Dynamic recompilers for 32-bit (x86) and 64-bit (amd64) machines
OpenGL video plugin, with Hi-resolution texture support
LIRC Infrared remote control support
Rumble Pak support (Linux only)
Cheat system with gameshark code support
Speed adjustment with smooth sound output
Shared library interface for integration into other systems (front-ends)
Command-line Front-end application

This was built on Ubuntu 9.10, linking against libpng 1.2. The featured Linux binary links against libpng 1.4, failing to run on some distributions including Ubuntu.

Download: Mupen64Plus v1.99.4 for Ubuntu x86
Download: Mupen64Plus v1.99.4 for Ubuntu x64
Source: Here