This comes from ensure_x11_unix_perms, which is determining that the /tmp/.X11-unix does not have at least permission bits 022:
---> static gboolean ensure_x11_unix_perms (GError **error) { /* Try to detect systems on which /tmp/.X11-unix is owned by neither root nor * ourselves because in that case the owner can take over the socket we create * (symlink races are fixed in linux 800179c9b8a1). This should not be * possible in the first place and systems should come with some way to ensure * that's the case (systemd-tmpfiles, polyinstantiation …). * * That check however only works if we see the root user namespace which might * not be the case when running in e.g. toolbx (root and other user are all * mapped to overflowuid). */ struct stat x11_tmp, tmp; if (lstat (X11_TMP_UNIX_DIR, &x11_tmp) != 0) { g_set_error (error, G_IO_ERROR, g_io_error_from_errno (errno), "Failed to check permissions on directory \"%s\": %s", X11_TMP_UNIX_DIR, g_strerror (errno)); return FALSE; } if (lstat (TMP_UNIX_DIR, &tmp) != 0) { g_set_error (error, G_IO_ERROR, g_io_error_from_errno (errno), "Failed to check permissions on directory \"%s\": %s", TMP_UNIX_DIR, g_strerror (errno)); return FALSE; } /* If the directory already exists, it should belong to the same * user as /tmp or belong to ourselves ... * (if /tmp is not owned by root or ourselves we're in deep trouble) */ if (x11_tmp.st_uid != tmp.st_uid && x11_tmp.st_uid != getuid ()) { g_set_error (error, G_IO_ERROR, G_IO_ERROR_PERMISSION_DENIED, "Wrong ownership for directory \"%s\"", X11_TMP_UNIX_DIR); return FALSE; } /* ... be writable ... */ if ((x11_tmp.st_mode & 0022) != 0022) { g_set_error (error, G_IO_ERROR, G_IO_ERROR_PERMISSION_DENIED, "Directory \"%s\" is not writable", X11_TMP_UNIX_DIR); return FALSE; } <--- So the bug is not in Mutter. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2069564 Title: gnome-shell crashed with SIGTRAP in meta_wayland_compositor_new() from meta_context_start() from main() ["Failed to start X Wayland: Directory \"/tmp/.X11-unix\" is not writable"] To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/2069564/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs