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According to wikipedia, Ubuntu for the most part is GPL Licensed: The only exceptions are some proprietary hardware drivers.
Is Linux a GPL?
The Linux Kernel is provided under the terms of the GNU General Public License version 2 only (GPL-2.0), as provided in LICENSES/preferred/GPL-2.0, with an explicit syscall exception described in LICENSES/exceptions/Linux-syscall-note, as described in the COPYING file.
What license is Ubuntu under?
Ubuntu
| Ubuntu 21.04 “Hirsute Hippo” | |
|---|---|
| Kernel type | Monolithic (Linux kernel) |
| Userland | GNU |
| Default user interface | GNOME |
| License | Free software + some proprietary device drivers |