我在一台旧的 Acer Aspire i5 430m 笔记本电脑上安装了 16.04。启动速度很慢，我进行了完全干净的安装，但速度仍然很慢。阅读了与此相关的其他几个问题后，我在启动后立即执行了 dmesg，并查找了时间上的大间隙，结果如下：
`33.548506] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
[ 33.548508] cfg80211: (2400000 KHz - 2483500 KHz @ 40000 KHz), (N/A, 2000 mBm), (N/A)
[ 33.548510] cfg80211: (5150000 KHz - 5250000 KHz @ 80000 KHz, 200000 KHz AUTO), (N/A, 2000 mBm), (N/A)
[ 33.548512] cfg80211: (5250000 KHz - 5350000 KHz @ 80000 KHz, 200000 KHz AUTO), (N/A, 2000 mBm), (0 s)
[ 33.548514] cfg80211: (5470000 KHz - 5725000 KHz @ 160000 KHz), (N/A, 2698 mBm), (0 s)
[ 33.548516] cfg80211: (57000000 KHz - 66000000 KHz @ 2160000 KHz), (N/A, 4000 mBm), (N/A)
[ 33.639494] wlp3s0: Limiting TX power to 20 (20 - 0) dBm as advertised by c0:3e:0f:b6:50:d9
[ 35.629797] hub_port_connect: 42 callbacks suppressed
[ 35.629804] usb 1-1-port1: connect-debounce failed
[ 182.136548] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[ 182.136560] pci 0000:00:1e.0: PCI bridge to [bus 04]
[ 182.136565] pci 0000:00:1e.0: bridge window [io 0x5000-0x5fff]
[ 182.136573] pci 0000:00:1e.0: bridge window [mem 0xdc700000-0xdc8fffff]
[ 182.136578] pci 0000:00:1e.0: bridge window [mem 0xdc900000-0xdcafffff 64bit pref]
[ 182.136659] pci_bus 0000:04: Allocating resources
[ 182.136673] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[ 182.136677] pci 0000:00:1e.0: PCI bridge to [bus 04]
[ 182.136680] pci 0000:00:1e.0: bridge window [io 0x5000-0x5fff]`
systemd-analyze 给了我这个：
Startup finished in 13.814s (kernel) + 2min 2.754s (userspace) = 2min 16.568s
systemd-analyze blame 给了我这个：
1min 49.592s networking.service
1min 48.973s apport.service
1min 48.431s grub-common.service
1min 48.091s irqbalance.service
1min 47.978s ondemand.service
1min 47.882s speech-dispatcher.service
1min 47.864s gpu-manager.service
5.501s dev-mapper-ubuntu\x2d\x2dvg\x2droot.device
4.077s accounts-daemon.service
3.548s thermald.service
3.524s NetworkManager.service
3.375s ModemManager.service
3.309s console-setup.service
3.017s apparmor.service
1.774s lvm2-monitor.service
1.758s polkitd.service
1.708s upower.service
1.491s systemd-logind.service
1.472s colord.service
1.313s systemd-journald.service
1.167s systemd-tmpfiles-setup-dev.service
1.136s systemd-modules-load.service
1.098s keyboard-setup.service
我不知道该怎么办。它是最新的，一旦启动，它似乎一切正常，而且不慢。有人能建议什么来加快速度吗？