Upgrading from 21.05 to 21.11 the installer said: Upgrade to 21.06.00.007 [15:41:52]: Bug 11879 - Add a new field to patron record: main contact method ERROR: {UNKNOWN}: DBI Exception: DBD::mysql::db do failed: Row size too large. The maximum row size for the used table type, not counting BLOBs, is 8126. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs at /usr/share/koha/lib/C4/Installer.pm line 738
Looks like same problem as Bug 28267 What is your OS and mariadb/mysql version please ?
Duplicate of bug 28267 *** This bug has been marked as a duplicate of bug 28267 ***