I have a similar issue—after "get " expansion I've got a segfault (without halt though).
** Attachment added: "Compressed dump" http://librarian.launchpad.net/5076104/_usr_bin_lftp.1000.crash.bz2 -- tab expansion after "rm " produces segmentation fault and halts system https://launchpad.net/bugs/70183 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
