Release 0.15.04 was accidentally compiled without Trezor support. Thus, Trezor Monero users on Linux are recommend to wait until next release (0.15.0.5) or compile the GUI by themselves.
yesissuesgui:Release 0.15.0.4 (Linux) was accidentally compiled without Trezor support. Thus, Trezor Monero users on Linux are recommend to wait until next release (0.15.0.5) or compile the GUI by themselves