I'm pretty certain this is not related to HSTS, and it is a setuid
issue:

[pid 19145] openat(3, "uid_map", O_WRONLY|O_LARGEFILE) = 6
[pid 19145] write(6, "0 10000 1\n1001 1001 1\n", 22) = -1 EPERM (Operation not 
permitted)
[pid 19145] write(2, "newuidmap: write to uid_map fail"..., 60) = 60
[pid 19142] <... read resumed> "newuidmap: write to uid_map fail"..., 4095) = 60
[pid 19145] exit_group(1)               = ?
[pid 19142] waitpid(19144,  <unfinished ...>
[pid 19145] +++ exited with 1 +++
[pid 19144] <... wait4 resumed> [{WIFEXITED(s) && WEXITSTATUS(s) == 1}], 0, 
NULL) = 19145
[pid 19144] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=19145, 
si_uid=1001, si_status=1, si_utime=0, si_stime=0} ---
[pid 19144] sigreturn({mask=[]})        = 19145
[pid 19144] exit_group(1)               = ?
[pid 19144] +++ exited with 1 +++
[pid 19142] <... waitpid resumed> [{WIFEXITED(s) && WEXITSTATUS(s) == 1}], 0) = 
19144
[pid 19142] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=19144, 
si_uid=1001, si_status=1, si_utime=0, si_stime=0} ---
[pid 19142] close(5)                    = 0
[pid 19142] write(2, "lxc 20180712141840.743 ERROR    "..., 204 <unfinished ...>
[pid 19141] <... read resumed> "lxc 20180712141840.743 ERROR    "..., 4095) = 
204
[pid 19141] waitpid(19142,  <unfinished ...>
[pid 19142] <... write resumed> )       = 204
[pid 19142] write(2, "error mapping child\n", 20) = 20
[pid 19142] write(7, "1", 1 <unfinished ...>
[pid 19143] <... read resumed> "1", 1)  = 1
[pid 19143] close(5)                    = 0
[pid 19143] close(6)                    = 0
[pid 19143] setgid32(0)                 = -1 EINVAL (Invalid argument)
[pid 19143] dup(2)                      = 4
[pid 19143] fcntl64(4, F_GETFL)         = 0x1 (flags O_WRONLY)
[pid 19142] <... write resumed> )       = 1
[pid 19143] close(4 <unfinished ...>
[pid 19142] waitpid(19143,  <unfinished ...>
[pid 19143] <... close resumed> )       = 0
[pid 19143] write(2, "setgid: Invalid argument\n", 25) = 25
[pid 19143] write(1, "WARN: could not reopen tty: No s"..., 108) = 108
[pid 19143] exit_group(-1)              = ?
[pid 19143] +++ exited with 255 +++
[pid 19142] <... waitpid resumed> [{WIFEXITED(s) && WEXITSTATUS(s) == 255}], 
__WALL) = 19143
[pid 19142] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=19143, 
si_uid=1001, si_status=255, si_utime=0, si_stime=0} ---
[pid 19142] exit_group(255)             = ?
[pid 19142] +++ exited with 255 +++
<... waitpid resumed> [{WIFEXITED(s) && WEXITSTATUS(s) == 255}], 0) = 19142
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=19142, si_uid=1001, 
si_status=255, si_utime=1, si_stime=2} ---
close(4)                                = 0
write(2, "Error creating container test\n", 30Error creating container test
) = 30
exit_group(1)                           = ?
+++ exited with 1 +++

Running lxc-create under sudo -H (I haven't created sub-ids for root)
works.

This stops me from creating or running any container, which is
wonderful.

** Summary changed:

- lxc container download error (possibly HSTS related)
+ lxc-create cannot setgid

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https://bugs.launchpad.net/bugs/1646462

Title:
  lxc-create cannot setgid

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