when I try to start ./startubuntu.sh it brings this error pls somebody help

[matamalewiscom-lab]

proot warning: can't sanitize binding "ubuntu-fs/tmp": No such file or directory
proot warning: can't chdir("/root/.") in the guest rootfs: No such file or directory
proot info: default working directory is now "/"
proot error: '/usr/bin/env' not found (root = /data/data/com.termux/files/home/ubuntu-in-termux/ubuntu-fs, cwd = /, $PATH=(null))

[barbarbar338]

(Run all these commands in ubuntu-in-termux folder)
Probably your rootfs is broken

1. Remove broken rootfs: rm -rf ubuntu-fs
2. Install valid rootfs tarball: wget -c https://partner-images.canonical.com/core/focal/current/ubuntu-focal-core-cloudimg-arm64-root.tar.gz (here I used arm64 because my device has arm64 cpu)
3. Extract into ubuntu-fs: mkdir ubuntu-fs && proot --link2symlink tar -xzf ubuntu-focal-core-cloudimg-arm64-root.tar.gz -C ubuntu-fs --exclude='dev' (here also don't forget to change the cpu arch)
4. Start the script: ./startubuntu.sh

This should work and fix your problems.

[inilim]

@barbarbar338 It worked for me, thanks.