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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:
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Or for longer, use three backticks above and below the code snippet:
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Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 20.0.5): 21.0.0
Operating system and version (eg, Ubuntu 20.04): Ubuntu Sever 20.04.02
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4.41
PHP version (eg, 7.4): 7.4
The issue you are facing:
Is this the first time you’ve seen this error? (Y/N):Yes
Steps to replicate it:
- Started webupdater
- webupdater stopped at step 7
- broke my entire nextcloud + collabera + redis + HPB instance hosted on digitalocean droplet
The output of your Nextcloud log in Admin > Logging:
2021-04-12T06:51:44+0000 NfUWFHNpvh [info] storage location: /nextcloud-data/updater-ocoi7zltix0b/downloads/
2021-04-12T06:51:45+0000 NfUWFHNpvh [info] end of verifyIntegrity()
2021-04-12T06:51:45+0000 NfUWFHNpvh [info] endStep("5")
2021-04-12T06:51:45+0000 NfUWFHNpvh [info] executeStep request for step "6"
2021-04-12T06:51:45+0000 NfUWFHNpvh [info] startStep("6")
2021-04-12T06:51:45+0000 NfUWFHNpvh [info] extractDownload()
2021-04-12T06:51:45+0000 NfUWFHNpvh [info] storage location: /nextcloud-data/updater-ocoi7zltix0b/downloads/
2021-04-12T06:51:48+0000 NfUWFHNpvh [info] end of extractDownload()
2021-04-12T06:51:48+0000 NfUWFHNpvh [info] endStep("6")
2021-04-12T06:51:48+0000 NfUWFHNpvh [info] executeStep request for step "7"
2021-04-12T06:51:48+0000 NfUWFHNpvh [info] startStep("7")
2021-04-12T06:51:48+0000 NfUWFHNpvh [info] setMaintenanceMode("true")
2021-04-12T06:51:48+0000 NfUWFHNpvh [info] configFileName /var/www/html/updater/../config/config.php
2021-04-12T06:51:48+0000 NfUWFHNpvh [info] end of setMaintenanceMode()
2021-04-12T06:51:48+0000 NfUWFHNpvh [info] endStep("7")
2021-04-12T06:51:48+0000 NfUWFHNpvh [info] executeStep request for step "8"
2021-04-12T06:51:48+0000 NfUWFHNpvh [info] startStep("8")
2021-04-12T06:51:48+0000 NfUWFHNpvh [info] replaceEntryPoints()
2021-04-12T06:51:48+0000 NfUWFHNpvh [info] replace index.php
2021-04-12T06:51:48+0000 NfUWFHNpvh [info] replace status.php
2021-04-12T06:51:48+0000 NfUWFHNpvh [info] replace remote.php
2021-04-12T06:51:48+0000 NfUWFHNpvh [info] replace public.php
2021-04-12T06:51:48+0000 NfUWFHNpvh [info] replace ocs/v1.php
2021-04-12T06:51:48+0000 NfUWFHNpvh [info] replace ocs/v2.php
2021-04-12T06:51:48+0000 NfUWFHNpvh [info] end of replaceEntryPoints()
2021-04-12T06:51:48+0000 NfUWFHNpvh [info] endStep("8")
2021-04-12T06:51:48+0000 NfUWFHNpvh [info] executeStep request for step "9"
2021-04-12T06:51:48+0000 NfUWFHNpvh [info] startStep("9")
2021-04-12T06:51:48+0000 NfUWFHNpvh [info] deleteOldFiles()
2021-04-12T06:51:48+0000 NfUWFHNpvh [error] executeStep request failed with other exception
2021-04-12T06:51:48+0000 NfUWFHNpvh [error] Exception: Exception
Message: Could not unlink: /var/www/html/updater/../.htaccess
Code:0
Trace:
#0 phar:///var/www/html/updater/updater.phar/lib/UpdateCommand.php(381): NC\Updater\Updater->deleteOldFiles()
#1 phar:///var/www/html/updater/updater.phar/lib/UpdateCommand.php(233): NC\Updater\UpdateCommand->executeStep()
#2 phar:///var/www/html/updater/updater.phar/vendor/symfony/console/Command/Command.php(256): NC\Updater\UpdateCommand->execute()
#3 phar:///var/www/html/updater/updater.phar/vendor/symfony/console/Application.php(820): Symfony\Component\Console\Command\Command->run()
#4 phar:///var/www/html/updater/updater.phar/vendor/symfony/console/Application.php(187): Symfony\Component\Console\Application->doRunCommand()
#5 phar:///var/www/html/updater/updater.phar/vendor/symfony/console/Application.php(118): Symfony\Component\Console\Application->doRun()
#6 phar:///var/www/html/updater/updater.phar/updater.php(10): Symfony\Component\Console\Application->run()
#7 /var/www/html/updater/updater.phar(10): require('phar:///var/www...')
#8 {main}
File:phar:///var/www/html/updater/updater.phar/lib/Updater.php
Line:868
2021-04-12T06:51:48+0000 NfUWFHNpvh [info] rollbackChanges("9")
2021-04-12T06:51:48+0000 NfUWFHNpvh [info] unlink .step
2021-04-12T06:51:48+0000 NfUWFHNpvh [info] rollbackChanges - step >= 7
2021-04-12T06:51:48+0000 NfUWFHNpvh [info] end of rollbackChanges()
I have to admit, I am a noob, thought webupdater is a safe thing and pressed the button.
Now a day later i realize it is not a trivial thing to go back to 21.0.0.
I would appreciate a hand how to solve this problem. I don’t mind rolling back, but again I am a noob, no clue how to do it.
Thanks.