BTW, this is my current minimal package selections,
And it runs fine in lxc.
aaa_base
aaa_elflibs
aaa_terminfo
bash
bin
bzip2
coreutils
cracklib
cyrus-sasl
db48
dcron
dhcpcd
dialog
diffutils
e2fsprogs
elfutils
elogind
elvis
etc
eudev
findutils
gawk
glibc-solibs
gnupg
gnutls
grep
gzip
iproute2
iputils
kmod
krb5
less
libcap-ng
libffi
libmnl
libpwquality
libtasn1
libtirpc
libunistring
logrotate
mpfr
net-tools
nettle
network-scripts
ncurses
openssh
openssl-solibs
p11-kit
pam
pam-krb5
pkgtools
procps-ng
sed
shadow
sharutils
slackpkg
strace
sysklogd
sysvinit
sysvinit-functions
sysvinit-scripts
tar
util-linux
wget
which
xz
