Ubuntu: Official ubuntu 16.04 vagrant cloud image boots very slowly



Question:

I have a very powerful host machine running vagrant/virtualbox. I've installed the official Xenial cloud image. It starts very slowly, more than 3 minutes. If I see the log of virtualbox, there are a couple period, where nothing happens in tens of seconds:

00:00:05.306399 GIM: KVM: Enabled wall-clock struct. at 0x0000000002103128 - u32Sec=1490709692 u32Nano=164211738 uVersion=2  00:00:15.853501 PIT: mode=2 count=0x12a5 (4773) - 249.98 Hz (ch=0)  00:00:17.635954 APIC0: Switched mode to x2APIC  00:00:18.161514 PIT: mode=0 count=0x10000 (65536) - 18.20 Hz (ch=0)  00:00:18.893709 CPUM: VCPU  1: Cached APIC base MSR = 0xfee00800  00:00:18.893902 APIC1: Switched mode to x2APIC  00:00:18.893941 GIM: KVM: VCPU  1: Enabled system-time struct. at 0x000000021ffed040 - u32TscScale=0xfffed226 i8TscShift=-1 uVersion=2 fFlags=0x1 uTsc=0x227f7943f uVirtNanoTS=0x113fa8853  00:00:40.767172 PIIX3 ATA: Ctl#0: RESET, DevSel=0 AIOIf=0 CmdIf0=0x00 (-1 usec ago) CmdIf1=0x00 (-1 usec ago)  00:00:40.767323 PIIX3 ATA: Ctl#0: finished processing RESET  00:00:40.770214 PIIX3 ATA: Ctl#1: RESET, DevSel=0 AIOIf=0 CmdIf0=0x00 (-1 usec ago) CmdIf1=0x00 (-1 usec ago)  00:00:40.770323 PIIX3 ATA: Ctl#1: finished processing RESET  00:00:57.578234 NAT: Link up  00:01:01.526079 LsiLogic#0: 2/0 (Bus/Target) doesn't exist  ...  00:01:01.535077 LsiLogic#0: Guest issued CDB {0x12, 0x0, 0x0, 0x0, 0x24, 0x0}  00:01:24.478703 AIOMgr: Flush failed with VERR_INVALID_PARAMETER, disabling async flushes  00:01:32.045017 VMMDev: Guest Additions information report: Version 5.1.18 r114002 '5.1.18'  

What is wrong?


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