Slow launch of Ubuntu Mate

I’ve been upgrading from 16.10 to 17.04 of Ubuntu Mate installed on a virtual machine.
After the end of the operation, the startup of the machine is quite slow. I used bleachbit to clean the machine but the result was not satisfactory.
About 2 minutes and half to start before about half.
Is there a way to make the virtual machine boot faster?

Hello
Can you post results of systemd-analyze blame ?

here it is:
indent preformatted text by 4 spaces
5.352s NetworkManager-wait-online.service
3.338s apt-daily.service
2.640s dev-sda1.device
2.607s vboxadd.service
2.165s ModemManager.service
1.999s accounts-daemon.service
1.782s [email protected]
1.604s apt-daily-upgrade.service
1.567s snapd.service
1.526s NetworkManager.service
1.339s apparmor.service
1.202s rsyslog.service
1.179s vboxadd-x11.service
1.117s networking.service
920ms grub-common.service
909ms loadcpufreq.service
877ms gpu-manager.service
831ms thermald.service
763ms polkit.service
694ms snap-repair.service
610ms avahi-daemon.service
579ms upower.service
555ms systemd-resolved.service
536ms keyboard-setup.service
496ms pppd-dns.service
439ms systemd-udevd.service
397ms rc-local.service
372ms lightdm.service
354ms apport.service
315ms irqbalance.service
243ms resolvconf.service
215ms openvpn.service
202ms ntp.service
190ms speech-dispatcher.service
185ms systemd-tmpfiles-setup-dev.service
163ms sys-kernel-debug.mount
161ms dev-hugepages.mount
155ms dev-mqueue.mount
142ms systemd-modules-load.service
136ms systemd-udev-trigger.service
132ms systemd-logind.service
123ms alsa-restore.service
122ms systemd-journald.service
116ms systemd-user-sessions.service
112ms vboxadd-service.service
103ms udisks2.service
97ms lm-sensors.service
97ms systemd-sysctl.service
95ms kmod-static-nodes.service
86ms systemd-random-seed.service
84ms plymouth-start.service
74ms [email protected]
71ms ufw.service
63ms tlp.service
63ms hddtemp.service
55ms systemd-journal-flush.service
53ms systemd-tmpfiles-setup.service
50ms setvtrgb.service
35ms rtkit-daemon.service
32ms cpufrequtils.service
21ms systemd-update-utmp.service
20ms plymouth-quit-wait.service
16ms snapd.autoimport.service
16ms sys-fs-fuse-connections.mount
15ms systemd-update-utmp-runlevel.service
14ms console-setup.service
13ms plymouth-read-write.service
9ms snapd.socket
7ms systemd-remount-fs.service
5ms postfix.service