Akonadi server doesn't start after upgrade

[deric]

ProcessControl: Application 'akonadiserver' returned with exit code 255 (Unknown error)
search paths: ("/usr/lib/x86_64-linux-gnu/qt4/bin", "/usr/lib/lightdm/lightdm", "/usr/local/sbin", "/usr/local/bin", "/usr/sbin", "/usr/bin", "/sbin", "/bin", "/usr/games", "/usr/local/games", "/usr/sbin", "/usr/local/sbin", "/usr/local/libexec", "/usr/libexec", "/opt/mysql/libexec", "/opt/local/lib/mysql5/bin", "/opt/mysql/sbin")
QSqlDatabasePrivate::removeDatabase: connection 'initConnection' is still in use, all queries will cease to work.
Database error: Cannot open database.
Last driver error: "QMYSQL: Unable to connect"
Last database error: "Can't connect to local MySQL server through socket '/home/deric/.local/share/akonadi/socket-d630/mysql.socket' (2)"
QSqlQuery::exec: database not open
Unable to open database "Can't connect to local MySQL server through socket '/home/deric/.local/share/akonadi/socket-d630/mysql.socket' (2) QMYSQL: Unable to connect"
"[
0: akonadiserver() [0x418114]
1: akonadiserver() [0x418541]
2: /lib/x86_64-linux-gnu/libc.so.6(+0x370b0) [0x7fd2b409c0b0]
3: /lib/x86_64-linux-gnu/libc.so.6(gsignal+0x37) [0x7fd2b409c037]
4: /lib/x86_64-linux-gnu/libc.so.6(abort+0x148) [0x7fd2b409f698]
5: /usr/lib/x86_64-linux-gnu/libQtCore.so.4(_Z17qt_message_output9QtMsgTypePKc+ 0x122) [0x7fd2b5b4f5c2]
6: akonadiserver() [0x41a3eb]
7: /usr/lib/x86_64-linux-gnu/libQtCore.so.4(_ZN9QIODevice5writeEPKcx+0xb4) [0x7fd2b5be99f4]
8: /usr/lib/x86_64-linux-gnu/libQtCore.so.4(+0x11662f) [0x7fd2b5bf462f]
9: /usr/lib/x86_64-linux-gnu/libQtCore.so.4(_ZN11QTextStreamD1Ev+0x3b) [0x7fd2b5bfcbcb]
10: akonadiserver() [0x41d2cd]
11: akonadiserver() [0x41e487]
12: akonadiserver() [0x411f43]
13: /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5) [0x7fd2b4086ea5]
14: akonadiserver() [0x4128d1]
]
"

[SteveRiley]

If you search the forum here, you'll find some posts that describe how to delete Akonadi resources. This forces the creation of new resources and databases. You won't lose any email when doing this.