Im using an ascii template I created (by installing a VM off the iso, then tarring up what was in the filesystem...), I've had success using it on older Pve (5.0?) or either I missed this warning or it's new on 5.2 - maybe it's ignorable.
extracting archive '/var/lib/vz/template/cache/devuan_ascii-9.0_amd64-20180118.tar.gz'
Total bytes read: 954204160 (910MiB, 116MiB/s)
Detected container architecture: amd64
Argument "ascii/ceres" isn't numeric in numeric lt (<) at /usr/share/perl5/PVE/LXC/Setup/Debian.pm line 75.
Creating SSH host key 'ssh_host_dsa_key' - this may take some time ...
extracting archive '/var/lib/vz/template/cache/devuan_ascii-9.0_amd64-20180118.tar.gz'
Total bytes read: 954204160 (910MiB, 116MiB/s)
Detected container architecture: amd64
Argument "ascii/ceres" isn't numeric in numeric lt (<) at /usr/share/perl5/PVE/LXC/Setup/Debian.pm line 75.
Creating SSH host key 'ssh_host_dsa_key' - this may take some time ...
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