Ubuntu 18 LT 安装在系统日志显示消息“几乎完成复制...”后终止：
May 15 20:11:48 ubuntu /install.py: keeping language packs for: en_US.UTF-8
May 15 20:11:49 ubuntu ubiquity: W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/bionic/InRelease Could not resolve 'archive.ubuntu.com'
May 15 20:11:49 ubuntu ubiquity: W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/bionic-security/InRelease Could not resolve 'security.ubuntu.com'
May 15 20:11:49 ubuntu ubiquity: W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/bionic-updates/InRelease Could not resolve 'archive.ubuntu.com'
May 15 20:11:49 ubuntu ubiquity: W: Some index files failed to download. They have been ignored, or old ones used instead.
May 15 20:11:49 ubuntu ubiquity: W: --force-yes is deprecated, use one of the options starting with --allow instead.
May 15 20:12:05 ubuntu ubiquity[3065]: debconffilter_done: ubi-usersetup (current: ubi-usersetup)
May 15 20:12:05 ubuntu ubiquity[3065]: Step_before = stepUserInfo
May 15 20:12:05 ubuntu kernel: [ 160.122935] do_trap: 106 callbacks suppressed
May 15 20:12:05 ubuntu kernel: [ 160.122937] traps: ubiquity[3065] trap int3 ip:7f5a4f42ac41 sp:7ffe319141a0 error:0 in libglib-2.0.so.0.5600.1[7f5a4f3d9000+113000]
May 15 20:12:15 ubuntu /install.py: Exception during installation:
May 15 20:12:15 ubuntu /install.py: Traceback (most recent call last):
May 15 20:12:15 ubuntu /install.py: File "/usr/share/ubiquity/install.py", line 765, in <module>
May 15 20:12:15 ubuntu /install.py: install.run()
May 15 20:12:15 ubuntu /install.py: File "/usr/share/ubiquity/install.py", line 135, in run
May 15 20:12:15 ubuntu /install.py: self.copy_all()
May 15 20:12:15 ubuntu /install.py: File "/usr/share/ubiquity/install.py", line 532, in copy_all
May 15 20:12:15 ubuntu /install.py: 'INFO', 'ubiquity/install/copying_minute')
May 15 20:12:15 ubuntu /install.py: File "/usr/lib/python3/dist-packages/debconf.py", line 83, in <lambda>
May 15 20:12:15 ubuntu /install.py: lambda *args, **kw: self.command(command, *args, **kw))
May 15 20:12:15 ubuntu /install.py: File "/usr/lib/python3/dist-packages/debconf.py", line 104, in command
May 15 20:12:15 ubuntu /install.py: status = int(status)
May 15 20:12:15 ubuntu /install.py: ValueError: invalid literal for int() with base 10: ''
May 15 20:12:15 ubuntu /install.py:
May 15 20:12:15 ubuntu nautilus-autostart.desktop[2173]: Trace/breakpoint trap (core dumped)
May 15 20:12:40 ubuntu dbus-daemon[1742]: [session uid=999 pid=1742] Activating via systemd: service name='org.gnome.Terminal' unit='gnome-terminal-server.service' requested by ':1.60' (uid=999 pid=2173 comm="nautilus-desktop " label="unconfined")
这是可重复的。我下一步该做什么？