26.04 is is still under development, moved to Project Discussion > Pre-Release Discussion
Check Known Problems in the Beta Release Notes, there may be something there that can help.
Known Problems
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Ubuntu Studio uses the same KDE Plasma desktop environment as the official Kubuntu release, and thus, may be affected by some of the same issues. This is also true of the core packages of Ubuntu. You can see their release notes here (Kubuntu) and here (All of Ubuntu).
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You will be prompted, upon first login of any new user, to reboot to apply proper audio configurations for audio production. This is intentional and is a workaround for the installer’s inability to configure the first user as part of the “audio” group or for new users to be added to the audio group automatically.