我已将 Ubuntu Server 18.04 安装为虚拟机，用作 Web 服务器，但启动时间非常长。在启动过程中，100 秒过去了，没有任何通知发生什么，然后启动过程似乎正常继续，一切似乎都正常。我有几个 16.04 在生产中，它们没有发生这种情况。
以下是 dmesg 输出的一部分，问题发生在 9.91 到 107.38 秒之间。我不知道这段时间内发生了什么：
[ 5.437236] sd 2:0:0:0: [sda] Attached SCSI disk
[ 5.595979] hv_utils: Registering HyperV Utility Driver
[ 5.601516] scsi host3: storvsc_host_t
[ 5.603642] input: Microsoft Vmbus HID-compliant Mouse as /devices/0006:045E:0621.0001/input/input4
[ 5.604162] hid 0006:045E:0621.0001: input: <UNKNOWN> HID v0.01 Mouse [Microsoft Vmbus HID-compliant Mouse] on
[ 5.628020] psmouse serio1: trackpoint: failed to get extended button data, assuming 3 buttons
[ 5.687359] hv_vmbus: registering driver hv_util
[ 5.703794] hv_utils: Heartbeat IC version 3.0
[ 5.723355] hv_utils: Shutdown IC version 3.0
[ 5.736464] hv_utils: TimeSync IC version 3.0
[ 5.752895] hv_utils: VSS IC version 5.0
[ 7.876183] random: crng init done
[ 9.916153] psmouse serio1: trackpoint: IBM TrackPoint firmware: 0x01, buttons: 3/3
[ 9.918321] input: TPPS/2 IBM TrackPoint as /devices/platform/i8042/serio1/input/input3
[ 107.456011] raid6: sse2x1 xor() 6011 MB/s
[ 107.520013] raid6: sse2x2 gen() 10094 MB/s
[ 107.584007] raid6: sse2x2 xor() 6636 MB/s
[ 107.648010] raid6: sse2x4 gen() 12081 MB/s
[ 107.728009] raid6: sse2x4 xor() 7607 MB/s
[ 107.812007] raid6: avx2x1 gen() 16748 MB/s
[ 107.884006] raid6: avx2x1 xor() 11320 MB/s
[ 107.948008] raid6: avx2x2 gen() 19159 MB/s
[ 108.012007] raid6: avx2x2 xor() 11900 MB/s
[ 108.076005] raid6: avx2x4 gen() 22272 MB/s
[ 108.140008] raid6: avx2x4 xor() 14181 MB/s
[ 108.159630] raid6: using algorithm avx2x4 gen() 22272 MB/s
[ 108.182276] raid6: .... xor() 14181 MB/s, rmw enabled
[ 108.200728] raid6: using avx2x2 recovery algorithm
[ 108.245762] xor: automatically using best checksumming function avx
[ 108.287018] async_tx: api initialized (async)
[ 108.643865] Btrfs loaded, crc32c=crc32c-intel
[ 108.896072] print_req_error: I/O error, dev fd0, sector 0
[ 108.900007] floppy: error 10 while reading block 0
[ 109.032390] EXT4-fs (sda2): mounted filesystem with ordered data mode. Opts: (null)
[ 109.364683] ip_tables: (C) 2000-2006 Netfilter Core Team
[ 109.402600] systemd[1]: systemd 237 running in system mode. (+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD -IDN2 +IDN -PCRE2 default-hierarchy=hybrid)
[ 109.425550] systemd[1]: Detected virtualization microsoft.
[ 109.457009] systemd[1]: Detected architecture x86-64.
任何帮助都将不胜感激！谢谢。