Questions about 21.04 are off-topic on Ask Ubuntu, unless you're asking how to upgrade to 21.10. Ubuntu 21.04 (Hirsute Hippo) was a non-LTS version released on April 22, 2021. It became End Of Life (EOL) on January 20, 2022.
Ubuntu 21.04 (Hirsute Hippo) was released on April 22, 2021 and became EOL (End Of Life) on January 20, 2022. Questions about 21.04 are thus off-topic on Ask Ubuntu, unless you're asking how to upgrade to 21.10.
Notable features include:
- Linux kernel 5.11
- Gnome 3.38, including:
- PulseAudio 14
- BlueZ 5.56
- NetworkManager 1.30
- Wayland is now the default on most configurations, which features better security and performance