I've installed ACS community version 6.2 using this guide. I can succesfully launch Alfresco on "http://192.168.120.130:8080/alfresco/" and login to it using admin account. I can also access "http://192.168.120.130:8080/share/page/", but when I try to log in with (admin/admin), the page just refreshes and nothing happens. When I use incorrect login info, the page informs me that authentification details haven't been recognized, so I assume that share can communicate with DB just fine.
I don't know whether this relates, but I needed to disable CSRFPolicy before by placing this in share-config-custom.xml
<config evaluator="string-compare" condition="CSRFPolicy" replace="true">
<properties>
<referer>http://192.168.120.130:8080/.*</referer>
<origin>http://192.168.120.130:8080</origin>
</properties>
I checked log for alfresco, share and catalina and there is no error.
Information from Alfresco admin console:

My alfresco-global.properties:
#
# Custom content and index data location
#
dir.root=/opt/alfresco-6.2.2./alf_data
#
# Sample database connection properties
#
db.username=alfresco
db.password=alfresco
db.name=alfresco
db.pool.max=275
#
# Choose DB connection properties for your database, e.g. for PostgreSQL
#
db.driver=org.postgresql.Driver
db.url=jdbc:postgresql://localhost:5432/alfresco
#
# URL Generation Parameters (The ${localname} token is replaced by the local server name)
#-------------
alfresco.context=alfresco
alfresco.host=192.168.120.130
alfresco.port=8080
alfresco.protocol=http
share.context=share
share.host=192.168.120.130
share.port=8080
share.protocol=http
# encryption
solr.secureComms=none
index.subsystem.name=solr6
# ssl encryption
encryption.ssl.keystore.location=${dir.keystore}/ssl.keystore
encryption.ssl.keystore.type=JCEKS
encryption.ssl.keystore.keyMetaData.location=
encryption.ssl.truststore.location=${dir.keystore}/ssl.truststore
encryption.ssl.truststore.type=JCEKS
encryption.ssl.truststore.keyMetaData.location=
# secret key keystore
#configurationencryption.keystore.location=${dir.keystore}/keystore
#encryption.keystore.keyMetaData.location=
#encryption.keystore.type=JCEKS
solr.host=localhost
solr.port=8983
solr.port.ssl=8983
local.transform.service.enabled=false
### Initial admin password ###
alfresco_user_store.adminpassword=209c6174da490caeb422f3fa5a7ae634
alfresco-pdf-renderer.root=/opt/alfresco-6.2.2./alfresco-pdf-renderer
alfresco-pdf-renderer.exe=${alfresco-pdf-renderer.root}/alfresco-pdf-renderer
alfresco-pdf-renderer.url=http://192.168.120.130:8090/
jodconverter.officeHome=/opt/alfresco-6.2.2./libreoffice/libreoffice6.4