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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Nextcloud version (eg, 14.0.3):
Operating system and version (eg, Ubuntu 17.04):
Apache or nginx version (eg, Apache 2.4.25):
PHP version (eg, 7.1):
The issue you are facing:
Hi,
I have the nextcloud VM, Im trying to update te underlaying OS… but dont seem to be able to log into putty shell ( I have been logged in previously)
I am using the ncadmin account, with password I specified ,but I get access denied. ( I can log onto web interface with said username/password) I laso tried the defaullt ubuntu one.
Should I be able to use the ncadmin user to login to console?
*(I recently moved vm to different host, but dont think that should affect logging on)