@Daniel:

*one
Timeout, server 21.0.0.52 is itself. 
jolanda@pavilion:~$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP 
group default qlen 1000
    link/ether 48:9e:bd:0e:96:1d brd ff:ff:ff:ff:ff:ff
    altname enp7s0
    inet 21.0.0.52/24 brd 21.0.0.255 scope global noprefixroute eno1
       valid_lft forever preferred_lft forever
    inet6 fe80::5125:b910:ac95:e50/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever
3: wlo1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP 
group default qlen 1000
    link/ether 14:18:c3:78:64:0f brd ff:ff:ff:ff:ff:ff
    altname wlp0s20f3
    inet 21.0.0.62/24 brd 21.0.0.255 scope global noprefixroute wlo1
       valid_lft forever preferred_lft forever
    inet6 fe80::f711:141f:56a:56c5/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

ps: the booting problem (black screen) also occurs when the system is
somewhere on the road, not connected to any network.

*two:
/dev/sdb1 is an external usb disk which should not interfere. It could be half 
connected or some other problem. I'll do an fsck on it

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https://bugs.launchpad.net/bugs/1960605

Title:
  System freeze

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