Here is what I have in on my host:
davidwallen@academystaging:/var/www/html$ php -i | grep "ctype"
/etc/php/7.0/cli/conf.d/20-ctype.ini,
ctype
ctype functions => enabled
davidwallen@academystaging:/var/www/html$ php -i | grep "mbstring"
/etc/php/7.0/cli/conf.d/20-mbstring.ini,
Zend Multibyte Support => provided by mbstring
mbstring
mbstring extension makes use of "streamable kanji code filter and converter", which is distributed under the GNU Lesser General Public License version 2.1.
mbstring.detect_order => no value => no value
mbstring.encoding_translation => Off => Off
mbstring.func_overload => 0 => 0
mbstring.http_input => no value => no value
mbstring.http_output => no value => no value
mbstring.http_output_conv_mimetypes => ^(text/|application/xhtml\+xml) => ^(text/|application/xhtml\+xml)
mbstring.internal_encoding => no value => no value
mbstring.language => neutral => neutral
mbstring.strict_detection => Off => Off
mbstring.substitute_character => no value => no value
davidwallen@academystaging:/var/www/html$ php -i | grep "iconv"
/etc/php/7.0/cli/conf.d/20-iconv.ini,
Registered Stream Filters => zlib.*, string.rot13, string.toupper, string.tolower, string.strip_tags, convert.*, consumed, dechunk, convert.iconv.*, mcrypt.*, mdecrypt.*
iconv
iconv support => enabled
iconv implementation => glibc
iconv library version => 2.24
iconv.input_encoding => no value => no value
iconv.internal_encoding => no value => no value
iconv.output_encoding => no value => no value

Yet, the installation check for Internationalization fails.