These errors would certainly correspond with "every few minutes" and, if actually accompanied with a dialog box, would be often enough to be insanely frustrating.
If there's something to configure in the system settings | Online Accounts, there might be an easy way to fix this; if not, I might be tempted to try apt-get purge account-plugin-ubuntuone and see what happens from there.
I suspect it is Ubuntu One:
Jul 13 17:55:16 hostname org.gnome. keyring. SystemPrompter[ 1889]: Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged. OneConf[ 1889]: ERROR:oneconf. networksync. ssohandler: credential error
Jul 13 17:55:18 hostname com.ubuntu.
$ grep "credential error" JournalErrors.txt OneConf[ 1889]: ERROR:oneconf. networksync. ssohandler: credential error OneConf[ 1889]: ERROR:oneconf. networksync. ssohandler: credential error OneConf[ 1889]: ERROR:oneconf. networksync. ssohandler: credential error OneConf[ 1889]: ERROR:oneconf. networksync. ssohandler: credential error OneConf[ 1889]: ERROR:oneconf. networksync. ssohandler: credential error OneConf[ 1889]: ERROR:oneconf. networksync. ssohandler: credential error OneConf[ 1889]: ERROR:oneconf. networksync. ssohandler: credential error OneConf[ 1889]: ERROR:oneconf. networksync. ssohandler: credential error OneConf[ 1889]: ERROR:oneconf. networksync. ssohandler: credential error OneConf[ 1889]: ERROR:oneconf. networksync. ssohandler: credential error OneConf[ 1889]: ERROR:oneconf. networksync. ssohandler: credential error OneConf[ 1889]: ERROR:oneconf. networksync. ssohandler: credential error OneConf[ 1889]: ERROR:oneconf. networksync. ssohandler: credential error
Jul 11 12:49:22 hostname com.ubuntu.
Jul 11 12:49:22 hostname com.ubuntu.
Jul 11 12:49:44 hostname com.ubuntu.
Jul 11 12:49:44 hostname com.ubuntu.
Jul 12 19:08:56 hostname com.ubuntu.
Jul 12 19:14:44 hostname com.ubuntu.
Jul 13 11:34:53 hostname com.ubuntu.
Jul 13 11:38:02 hostname com.ubuntu.
Jul 13 17:50:19 hostname com.ubuntu.
Jul 13 17:55:18 hostname com.ubuntu.
Jul 13 18:17:27 hostname com.ubuntu.
Jul 13 18:44:22 hostname com.ubuntu.
Jul 13 18:50:08 hostname com.ubuntu.
These errors would certainly correspond with "every few minutes" and, if actually accompanied with a dialog box, would be often enough to be insanely frustrating.
If there's something to configure in the system settings | Online Accounts, there might be an easy way to fix this; if not, I might be tempted to try apt-get purge account- plugin- ubuntuone and see what happens from there.