mk-sbuild --name bionic --arch=amd64 --distro=ubuntu bionic
...
I: Validating tar 1.29b-2
I: Retrieving ubuntu-keyring 2016.10.27
I: Validating ubuntu-keyring 2016.10.27
I: Retrieving util-linux 2.30.1-0ubuntu4
I: Validating util-linux 2.30.1-0ubuntu4
I: Retrieving xz-utils 5.2.2-1.3
I: Validating xz-utils 5.2.2-1.3
I: Retrieving zlib1g 1%3a1.2.11.dfsg-0ubuntu2
I: Validating zlib1g 1%3a1.2.11.dfsg-0ubuntu2
I: Chosen extractor for .deb packages: dpkg-deb
I: Extracting base-files...
I: Extracting base-passwd...
[{WIFEXITED(s) && WEXITSTATUS(s) == 2}], 0, NULL) = 31093
rt_sigaction(SIGINT, {SIG_DFL, [], SA_RESTORER, 0x7f26f01c3cb0}, {0x4438d0, [], SA_RESTORER, 0x7f26f01c3cb0}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=31093, si_status=2, si_utime=0, si_stime=0} ---
wait4(-1, 0x7ffeaf78db98, WNOHANG, NULL) = -1 ECHILD (No child processes)
rt_sigreturn() = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
exit_group(2) = ?
+++ exited with 2 +++