Bug 416016

Can confirm. Updated to 5.17.5 half an hour ago, and now I'm stuck out of my mail. This can't be happening...

If anyone knows of a workaround before the fix comes, please share!

Plasma is unrelated to KDEPIM. Which other packages besides Plasma did you update? Anything SQL database related?

(In reply to Christoph Feck from comment #2)
> Plasma is unrelated to KDEPIM. Which other packages besides Plasma did you
> update? Anything SQL database related?

I've the same identical problem. 
I'm using KDE Neon LTE User edition and apply all suggested update everyday. 
I've nomore additional repositories but nextcloud-client one.

After an upgrade (as suggested and processed by discover) from Plasma 5.17.4 to 5.17.5 and a normal reboot, Akonadi refused to start. 
Nothing else.

Christoph Feck is absolutely right. I also applied all updates in KDE Neon, and assumed all the packages were 5.17.5 related, because that was all Synaptic was showing me. However, it seems that an akonadi update to build41 (same version, new build) snuck into my update too. The problem lies within those packages.

I had to downgrade those packages to build39. This command did the trick for me:

sudo apt-get install akonadi-backend-mysql=4:19.12.0-0xneon+18.04+bionic+build39 akonadi-server=4:19.12.0-0xneon+18.04+bionic+build39 libkf5akonadiagentbase5=4:19.12.0-0xneon+18.04+bionic+build39 libkf5akonadicore5=4:19.12.0-0xneon+18.04+bionic+build39 libkf5akonadi-data=4:19.12.0-0xneon+18.04+bionic+build39 libkf5akonadiprivate5=4:19.12.0-0xneon+18.04+bionic+build39 libkf5akonadiwidgets5=4:19.12.0-0xneon+18.04+bionic+build39 libkf5akonadixml5=4:19.12.0-0xneon+18.04+bionic+build39

This is an issue with apparmor and Ubuntu. Everything works if the apparmor profile usr.bin.akonadiserver is disabled.

It seems that the apparmor profile provided in the KDE Neon package akonadi-server needs at least a line to allow read and write in /run/user :

owner /{,var/}run/user/@{uid}/akonadi** rwk,

Not that this line is present in the master branch :
https://cgit.kde.org/akonadi.git/tree/apparmor/usr.bin.akonadiserver

(In reply to Bruno Patri from comment #5)
> This is an issue with apparmor and Ubuntu. Everything works if the apparmor
> profile usr.bin.akonadiserver is disabled.
> 
> It seems that the apparmor profile provided in the KDE Neon package
> akonadi-server needs at least a line to allow read and write in /run/user :
> 
> owner /{,var/}run/user/@{uid}/akonadi** rwk,
> 
> Not that this line is present in the master branch :
> https://cgit.kde.org/akonadi.git/tree/apparmor/usr.bin.akonadiserver

It works for me...thank you!

(In reply to dharman from comment #6)
> (In reply to Bruno Patri from comment #5)
> > This is an issue with apparmor and Ubuntu. Everything works if the apparmor
> > profile usr.bin.akonadiserver is disabled.
> > 
> > It seems that the apparmor profile provided in the KDE Neon package
> > akonadi-server needs at least a line to allow read and write in /run/user :
> > 
> > owner /{,var/}run/user/@{uid}/akonadi** rwk,
> > 
> > Not that this line is present in the master branch :
> > https://cgit.kde.org/akonadi.git/tree/apparmor/usr.bin.akonadiserver
> 
> It works for me...thank you!
Unfortunately this has not worked for me

Changes to apparmor profiles typically need a reboot to take effect

(In reply to Jonathan Riddell from comment #8)
> Changes to apparmor profiles typically need a reboot to take effect

Yes I know. But still this doesn't help.

(In reply to Stefan from comment #7)
…
> > > https://cgit.kde.org/akonadi.git/tree/apparmor/usr.bin.akonadiserver
> > 
> > It works for me...thank you!
> Unfortunately this has not worked for me

If you replace the two files under /etc/apparmor.d usr.bin.akonadiserver and mysql_akonadi by the ones in https://cgit.kde.org/akonadi.git/tree/apparmor, it should work.

(In reply to Bruno Patri from comment #10)
> (In reply to Stefan from comment #7)
> …
> > > > https://cgit.kde.org/akonadi.git/tree/apparmor/usr.bin.akonadiserver
> > > 
> > > It works for me...thank you!
> > Unfortunately this has not worked for me
> 
> If you replace the two files under /etc/apparmor.d usr.bin.akonadiserver and
> mysql_akonadi by the ones in https://cgit.kde.org/akonadi.git/tree/apparmor,
> it should work.

This doesn't work either.

The fix is now published, please update and reboot.

@Jonathan Riddell, thanks for the quick fix.
It works  now.

(In reply to Bruno Patri from comment #13)
> @Jonathan Riddell, thanks for the quick fix.
> It works  now.
I can confirm this too. After removing the leftovers:
rm /etc/apparmor.d/usr.bin.akonadiserver*
rm /etc/apparmor.d/usr.sbin.mysqld-akonadi*

By the way this was enough to reload the profiles:
systemctl restart apparmor.service

There is only one profile now:
/etc/apparmor.d/mysqld_akonadi

KDENeon plasma 5.17.5

kot@kot-MS-7930:~$ akonadictl start
Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
kot@kot-MS-7930:~$ Invalid Context= "Panel" line for icon theme:  "/usr/share/icons/Numix-Circle/16/panel/"
Invalid Context= "Panel" line for icon theme:  "/usr/share/icons/Numix-Circle/16@2x/panel/"
Invalid Context= "Panel" line for icon theme:  "/usr/share/icons/Numix-Circle/22/panel/"
Invalid Context= "Panel" line for icon theme:  "/usr/share/icons/Numix-Circle/22@2x/panel/"
Invalid Context= "Panel" line for icon theme:  "/usr/share/icons/Numix-Circle/24/panel/"
Invalid Context= "Panel" line for icon theme:  "/usr/share/icons/Numix-Circle/24@2x/panel/"
org.kde.pim.akonadiserver: Starting up the Akonadi Server...
org.kde.pim.akonadiprivate: StandardDirs::saveDir: failed to create directory ' "/run/user/1000/akonadi" '
QDir::mkpath: Empty or null file name
org.kde.pim.akonadiserver: Creating socket directory with name "" failed: Выполнено
org.kde.pim.akonadiserver: Could not create socket directory for Akonadi.
org.kde.pim.akonadiprivate: StandardDirs::saveDir: failed to create directory ' "/run/user/1000/akonadi" '
QDir::mkpath: Empty or null file name
org.kde.pim.akonadiserver: Creating socket directory with name "" failed: Выполнено
org.kde.pim.akonadiserver: Could not create socket directory for Akonadi.
akonadi.collectionattributetable                   OK
akonadi.collectionmimetyperelation                 OK
akonadi.collectionpimitemrelation                  OK
akonadi.collectiontable                            OK
akonadi.flagtable                                  OK
akonadi.mimetypetable                              OK
akonadi.parttable                                  OK
akonadi.parttypetable                              OK
akonadi.pimitemflagrelation                        OK
akonadi.pimitemtable                               OK
akonadi.pimitemtagrelation                         OK
akonadi.relationtable                              OK
akonadi.relationtypetable                          OK
akonadi.resourcetable                              OK
akonadi.schemaversiontable                         OK
akonadi.tagattributetable                          OK
akonadi.tagremoteidresourcerelationtable           OK
akonadi.tagtable                                   OK
akonadi.tagtypetable                               OK
org.kde.pim.akonadiprivate: StandardDirs::saveDir: failed to create directory ' "/run/user/1000/akonadi" '
QDir::mkpath: Empty or null file name
org.kde.pim.akonadiserver: Creating socket directory with name "" failed: Выполнено
org.kde.pim.akonadiserver: Could not create socket directory for Akonadi.
org.kde.pim.akonadiserver: Running DB initializer
org.kde.pim.akonadiserver: DB initializer done
Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
org.kde.pim.akonadiserver: Unable to connect to dbus service:  "An AppArmor policy prevents this sender from sending this message to this recipient; type=\"method_call\", sender=\":1.228\" (uid=1000 pid=29849 comm=\"/usr/bin/akonadiserver \" label=\"/usr/bin/akonadiserver (enforce)\") interface=\"org.freedesktop.DBus\" member=\"RequestName\" error name=\"(unset)\" requested_reply=\"0\" destination=\"org.freedesktop.DBus\" (bus)"
org.kde.pim.akonadicontrol: Application '/usr/bin/akonadiserver' exited normally...

(In reply to KOT040188 from comment #15)
> KDENeon plasma 5.17.5
Have you updated your system? Afterwards you have to reboot (more secure) or to run
service apparmor teardown
systemctl restart apparmor.service

(In reply to Stefan from comment #16)
> (In reply to KOT040188 from comment #15)
> > KDENeon plasma 5.17.5
> Have you updated your system? Afterwards you have to reboot (more secure) or
> to run
> service apparmor teardown
> systemctl restart apparmor.service

Yes, I updated. systemctl restart apparmor.service did not help, but I rebooted the system and everything is fine.

(In reply to KOT040188 from comment #17)
> (In reply to Stefan from comment #16)
> > (In reply to KOT040188 from comment #15)
> > > KDENeon plasma 5.17.5
> > Have you updated your system? Afterwards you have to reboot (more secure) or
> > to run
> > service apparmor teardown
> > systemctl restart apparmor.service
> 
> Yes, I updated. systemctl restart apparmor.service did not help, but I
> rebooted the system and everything is fine.

Sorry I was wrong in Comment 14. As written in comment 16 it's necessary to run the teardown command before.