I finally found the real problem - it is clearly stated in the [syslog](https://launchpadlibrarian.net/569529666/UbiquitySyslog.txt) (now we know how useful is to read logs!!!):
``` Nov 18 08:32:16 xubuntu ubiquity: chroot: failed to run command ‘tempfile’ <-- this Nov 18 08:32:16 xubuntu ubiquity: : No such file or directory ``` Previous Ubuntu 20211105 has this `/bin/tempfile` executable in place, it came from `debianutils` package with version 4.11.2build1 . See search result from Impish ( https://packages.ubuntu.com/search?searchon=contents&keywords=tempfile&mode=exactfilename&suite=impish&arch=any ) . But the modern 5.5-1 version from the newest image do not provide the `/bin/tempfile` executable, so it is missed. It is actually bug 1951742 . So the temporary fix is the following: 1. Launch ISO (tested on Ubuntu MATE 20211120) 2. Start it in Try… mode 3. Launch Ubiquity installer 4. Wait for appearing of "Who are you?" page 5. Open terminal with <Ctrl>+<Alt>+<T> to download previous version of `debianutils` and copy /bin/tempfile to /target/usr/bin directory by wget http://archive.ubuntu.com/ubuntu/pool/main/d/debianutils/debianutils_4.11.2_amd64.deb sudo apt-get install --allow-downgrades -y ./debianutils_4.11.2_amd64.deb sudo mkdir -p /target/usr/bin sudo cp -v /bin/tempfile /target/usr/bin/ 6. Return to Ubiquity window and finish the installation. 7. Enjoy installed system. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1951399 Title: Ubuntu, Budgie, Kubuntu, Kylin, MATE, Xubuntu: jammy daily fails to install To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1951399/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
