Developer ditches Termux proot for Android's AVF to build Flutter APKs on ARM64

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A developer running Claude Code and Flutter inside Termux with proot-distro on Android found the setup too slow due to proot's syscall interception overhead via ptrace. To fix this, they switched to Android's built-in Virtualization Framework (AVF), which provides a real isolated Linux kernel with no translation layer. Enabling AVF required turning on Developer Options and toggling the Linux Development Environment setting, which installs a Debian-based VM accessible through a Terminal app. Once inside the VM, the official Claude Code installer worked cleanly and Flutter builds ran successfully, though ARM64 incompatibilities with x86_64 SDK tools like aapt2 required separate fixes. The developer confirmed the AVF environment is fully isolated from existing Termux setups and can be removed or reset at any time through the Terminal app's settings.

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