if you get smarty errors on the install-tiki.php try
chmod 777 templates_c
or better
chmod -R 777 *
which will change perms for all folders... this was an old install bug but should be gone now in the latest release of Tikiwiki
You may also get something like below:
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Tiki installer v1.7 -Eta Carinae-
reload
We have problems!
The following directories must be writeable by Tiki, please check the permissions on
those directories and then re-run the install script.
db/
img/wiki
img/wiki_up
modules/cache
templates_c
backups
dump
temp
try again!
you can try
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chmod -R 777 *
There have been problems reported with passwords on installation but again the latest release of Tiki fixes many install problems.