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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
Or for longer, use three backticks above and below the code snippet:
longer
example
here
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): 28.0.0 beta 1
Operating system and version (eg, Ubuntu 20.04): Debian 11 Bullseye x64
Apache or nginx version (eg, Apache 2.4.25): NGINX 1.18.0
PHP version (eg, 7.4): 8.1
The issue you are facing:
Following error after updating from NC 2.7 to 28.
Exception: Database error when running migration 28000Date20230906104802 for app core Index name "sat" for table "oc_social_3_stream_dest" collides with the constraint on table "oc_social_stream_dest".
Is this the first time you’ve seen this error? (Y/N):Y
Steps to replicate it:
- Run update command on CLI
- Running update from the web
- N/A
The output of your config.php file in /path/to/nextcloud:
<?php
$CONFIG = array (
'instanceid' => 'REMOVED',
'passwordsalt' => 'REMOVED',
'secret' => 'REMOVED',
'trusted_domains' =>
array (
0 => 'cloud.myserver.net',
),
'datadirectory' => '/usr/share/nextcloud/data',
'dbtype' => 'mysql',
'version' => '27.1.3.2',
'overwrite.cli.url' => 'https://cloud.myserver.net',
'overwriteprotocol' => 'https',
'dbname' => 'nextcloud',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'nextcloud',
'dbpassword' => 'REMOVED',
'installed' => true,
'mail_smtpmode' => 'smtp',
'mail_sendmailmode' => 'smtp',
'mail_smtphost' => 'mail.myserver.net',
'mail_smtpport' => '465',
'mail_from_address' => 'no-reply',
'mail_domain' => 'myserver.net',
'theme' => '',
'default_phone_region' => 'US',
'memcache.local' => '\\OC\\Memcache\\APCu',
'memcache.distributed' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => '127.0.0.1',
'port' => 6379,
),
'filelocking.enabled' => true,
'memcache.locking' => '\\OC\\Memcache\\Redis',
'app_install_overwrite' =>
array (
0 => 'drawio',
1 => 'dropit',
2 => 'printer',
3 => 'transmission',
4 => 'checksum',
5 => 'files_external_gdrive',
6 => 'ocsms',
7 => 'radio',
8 => 'uploaddetails',
9 => 'files_frommail',
10 => 'ocr',
11 => 'occweb',
12 => 'passwords',
13 => 'socialsharing_email',
14 => 'bruteforcesettings',
15 => 'richdocuments',
16 => 'contacts',
17 => 'theming_customcss',
18 => 'side_menu',
19 => 'extract',
20 => 'forms',
21 => 'fulltextsearch',
22 => 'files_fulltextsearch',
23 => 'maps',
24 => 'metadata',
25 => 'music',
26 => 'news',
27 => 'ocdownloader',
28 => 'registration',
29 => 'spreed',
30 => 'social',
31 => 'talk_matterbridge',
32 => 'tasks',
33 => 'video_converter',
34 => 'twofactor_nextcloud_notification',
35 => 'talk_simple_poll',
36 => 'files_retention',
37 => 'ransomware_protection',
38 => 'quota_warning',
39 => 'imageconverter',
40 => 'breezedark',
41 => 'apporder',
42 => 'appointments',
43 => 'announcementcenter',
44 => 'files_downloadactivity',
45 => 'fulltextsearch_elasticsearch',
46 => 'geoblocker',
47 => 'files_trackdownloads',
48 => 'cpanelmailsync',
49 => 'facerecognition',
50 => 'flowupload',
51 => 'ojsxc',
52 => 'carnet',
53 => 'group_everyone',
54 => 'podcast',
55 => 'cms_pico',
56 => 'files_antivirus',
57 => 'deck',
58 => 'duplicatefinder',
59 => 'electronicsignatures',
60 => 'quickaccesssorting',
61 => 'files_accesscontrol',
62 => 'files_automatedtagging',
63 => 'guests',
64 => 'files_linkeditor',
65 => 'ncdownloader',
66 => 'onlyoffice',
67 => 'recognize',
68 => 'scanner',
69 => 'sharerenamer',
70 => 'timemanager',
71 => 'uppush',
72 => 'approval',
73 => 'external',
74 => 'gestion',
75 => 'integration_google',
76 => 'mediadc',
77 => 'phonetrack',
78 => 'passman',
79 => 'quicknotes',
80 => 'files_snapshots',
81 => 'twofactor_email',
82 => 'unroundedcorners',
83 => 'user_migration',
84 => 'files_readmemd',
85 => 'co2clock',
86 => 'files_3d',
87 => 'cfg_share_links',
88 => 'transfer',
89 => 'money',
90 => 'files_archive',
91 => 'camerarawpreviews',
92 => 'files_zip',
93 => 'groupfolders',
94 => 'externalpassword',
95 => 'snappymail',
96 => 'pdfdraw',
97 => 'sms_relentless',
98 => 'sensorlogger',
99 => 'folderplayer',
),
'maintenance' => false,
'loglevel' => 0,
'updater.release.channel' => 'beta',
'mail_smtpsecure' => 'ssl',
'mail_smtpauthtype' => 'LOGIN',
'has_rebuilt_cache' => true,
'ldapProviderFactory' => 'OCA\\User_LDAP\\LDAPProviderFactory',
'ncd_admin_settings' =>
array (
'ncd_aria2_rpc_host' => '127.0.0.1',
'focusVisibleAdded' => '',
'ncd_aria2_rpc_port' => '6800',
'ncd_aria2_rpc_token' => 'ncdownloader123',
'ncd_aria2_binary' => '/usr/bin/aria2c',
'disallow_aria2_settings' => '1',
),
'global_aria2_config' =>
array (
'bt-max-peers' => '100',
),
'memories.exiftool' => '/usr/share/nextcloud/apps/memories/bin-ext/exiftool-amd64-glibc',
'memories.vod.path' => '/usr/share/nextcloud/apps/memories/bin-ext/go-vod-amd64',
'memories.vod.ffmpeg' => '/usr/bin/ffmpeg',
'memories.vod.ffprobe' => '/usr/bin/ffprobe',
'enabledPreviewProviders' =>
array (
0 => 'OC\\Preview\\Image',
),
);
Output errors in nextcloud.log in /var/www/ or as admin user in top right menu, filtering for errors. Use a pastebin service if necessary.