我正在使用 Kubuntu 18.04.2，我打开终端并输入以下命令进行更新：
sudo apt update
其结果如下：
[sudo] password for aayush:
Hit:1 http://packages.microsoft.com/repos/vscode stable InRelease
Hit:2 http://in.archive.ubuntu.com/ubuntu bionic InRelease
Get:3 http://in.archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB]
Get:4 http://security.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB]
Get:5 http://security.ubuntu.com/ubuntu bionic-security/main amd64 DEP-11 Metadata [17.9 kB]
Get:6 http://in.archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB]
Get:7 http://security.ubuntu.com/ubuntu bionic-security/main DEP-11 64x64 Icons [25.6 kB]
Get:8 http://in.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages [658 kB]
Get:9 http://security.ubuntu.com/ubuntu bionic-security/main DEP-11 128x128 Icons [59.3 kB]
Get:10 http://security.ubuntu.com/ubuntu bionic-security/universe amd64 DEP-11 Metadata [36.1 kB]
Get:11 http://security.ubuntu.com/ubuntu bionic-security/universe DEP-11 48x48 Icons [16.4 kB]
Get:12 http://security.ubuntu.com/ubuntu bionic-security/universe DEP-11 64x64 Icons [104 kB]
Get:13 http://security.ubuntu.com/ubuntu bionic-security/universe DEP-11 128x128 Icons [149 kB]
Get:14 http://security.ubuntu.com/ubuntu bionic-security/multiverse amd64 DEP-11 Metadata [2,464 B]
Get:15 http://in.archive.ubuntu.com/ubuntu bionic-updates/main i386 Packages [544 kB]
Ign:16 http://in.archive.ubuntu.com/ubuntu bionic-updates/main amd64 DEP-11 Metadata
Ign:17 http://in.archive.ubuntu.com/ubuntu bionic-updates/main DEP-11 48x48 Icons
42% [Connecting to in.archive.ubuntu.com (91.189.88.24)]
42% [Connecting to in.archive.ubuntu.com (91.189.88.24)]
Ign:18 http://in.archive.ubuntu.com/ubuntu bionic-updates/main DEP-11 64x64 Icons
Ign:19 http://in.archive.ubuntu.com/ubuntu bionic-upd ates/main DEP-11 128x128 Icons
Ign:20 http://in.archive.ubuntu.com/ubuntu bionic-updates/universe amd64 Packages
Ign:21 http://in.archive.ubuntu.com/ubuntu bionic-updates/universe i386 Packages
Ign:22 http://in.archive.ubuntu.com/ubuntu bionic-updates/universe amd64 DEP-11 Metadata
Ign:23 http://in.archive.ubuntu.com/ubuntu bionic-updates/universe DEP-11 48x48 Icons
Ign:24 http://in.archive.ubuntu.com/ubuntu bionic-updates/universe DEP-11 64x64 Icons
Ign:25 http://in.archive.ubuntu.com/ubuntu bionic-updates/universe DEP-11 128x128 Icons
Ign:26 http://in.archive.ubuntu.com/ubuntu bionic-updates/multiverse amd64 DEP-11 Metadata
Ign:27 http://in.archive.ubuntu.com/ubuntu bionic-backports/universe amd64 DEP-11 Metadata
Ign:16 http://in.archive.ubuntu.com/ubuntu bionic-updates/main amd64 DEP-11 Metadata
Ign:17 http://in.archive.ubuntu.com/ubuntu bionic-updates/main DEP-11 48x48 Icons
Ign:18 http://in.archive.ubuntu.com/ubuntu bionic-updates/main DEP-11 64x64 Icons
Ign:19 http://in.archive.ubuntu.com/ubuntu bionic-updates/main DEP-11 128x128 Icons
Ign:20 http://in.archive.ubuntu.com/ubuntu bionic-updates/universe amd64 Packages
Ign:21 http://in.archive.ubuntu.com/ubuntu bionic-updates/universe i386 Packages
Ign:22 http://in.archive.ubuntu.com/ubuntu bionic-updates/universe amd64 DEP-11 Metadata
Ign:23 http://in.archive.ubuntu.com/ubuntu bionic-updates/universe DEP-11 48x48 Icons
Ign:24 http://in.archive.ubuntu.com/ubuntu bionic-updates/universe DEP-11 64x64 Icons
Ign:25 http://in.archive.ubuntu.com/ubuntu bionic-updates/universe DEP-11 128x128 Icons
Ign:26 http://in.archive.ubuntu.com/ubuntu bionic-updates/multiverse amd64 DEP-11 Metadata
Ign:27 http://in.archive.ubuntu.com/ubuntu bionic-backports/universe amd64 DEP-11 Metadata
Ign:16 http://in.archive.ubuntu.com/ubuntu bionic-updates/main amd64 DEP-11 Metadata
Err:17 http://in.archive.ubuntu.com/ubuntu bionic-updates/main DEP-11 48x48 Icons
Connection failed [IP: 2001:67c:1360:8001::21 80]
Err:18 http://in.archive.ubuntu.com/ubuntu bionic-updates/main DEP-11 64x64 Icons
Connection failed [IP: 2001:67c:1360:8001::21 80]
Err:19 http://in.archive.ubuntu.com/ubuntu bionic-updates/main DEP-11 128x128 Icons
Could not connect to in.archive.ubuntu.com:80 (2001:67c:1562::19), connection timed out Could not connect to in.archive.ubuntu.com:80 (91.189.88.31), connection timed out Could not connect to in.archive.ubuntu.com:80 (2001:67c:1560:8001::14), connection timed out Could not connect to in.archive.ubuntu.com:80 (91.189.88.149), connection timed out Could not connect to in.archive.ubuntu.com:80 (2001:67c:1360:8001::17), connection timed out Could not connect to in.archive.ubuntu.com:80 (91.189.91.26), connection timed out Could not connect to in.archive.ubuntu.com:80 (2001:67c:1360:8001::21), connection timed out Could not connect to in.archive.ubuntu.com:80 (91.189.88.162), connection timed out Could not connect to in.archive.ubuntu.com:80 (2001:67c:1560:8001::11), connection timed out Could not connect to in.archive.ubuntu.com:80 (91.189.91.23), connection timed out Could not connect to in.archive.ubuntu.com:80 (91.189.88.24), connection timed out [IP: 2001:67c:1560:8001::11 80]
Err:20 http://in.archive.ubuntu.com/ubuntu bionic-updates/universe amd64 Packages
Unable to connect to in.archive.ubuntu.com:http: [IP: 2001:67c:1560:8001::11 80]
Err:21 http://in.archive.ubuntu.com/ubuntu bionic-updates/universe i386 Packages
Unable to connect to in.archive.ubuntu.com:http: [IP: 2001:67c:1560:8001::11 80]
Err:22 http://in.archive.ubuntu.com/ubuntu bionic-updates/universe amd64 DEP-11 Metadata
Unable to connect to in.archive.ubuntu.com:http: [IP: 2001:67c:1560:8001::11 80]
Err:23 http://in.archive.ubuntu.com/ubuntu bionic-updates/universe DEP-11 48x48 Icons
Unable to connect to in.archive.ubuntu.com:http: [IP: 2001:67c:1560:8001::11 80]
Err:24 http://in.archive.ubuntu.com/ubuntu bionic-updates/universe DEP-11 64x64 Icons
Unable to connect to in.archive.ubuntu.com:http: [IP: 2001:67c:1560:8001::11 80]
Err:25 http://in.archive.ubuntu.com/ubuntu bionic-updates/universe DEP-11 128x128 Icons
Unable to connect to in.archive.ubuntu.com:http: [IP: 2001:67c:1560:8001::11 80]
Err:26 http://in.archive.ubuntu.com/ubuntu bionic-updates/multiverse amd64 DEP-11 Metadata
Unable to connect to in.archive.ubuntu.com:http: [IP: 2001:67c:1560:8001::11 80]
Ign:27 http://in.archive.ubuntu.com/ubuntu bionic-backports/universe amd64 DEP-11 Metadata
Err:27 http://in.archive.ubuntu.com/ubuntu bionic-backports/universe amd64 DEP-11 Metadata
Unable to connect to in.archive.ubuntu.com:http: [IP: 2001:67c:1560:8001::11 80]
Fetched 1,866 kB in 6min 30s (4,784 B/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
All packages are up to date.
W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/bionic-updates/main/dep11/icons-48x48.tar Connection failed [IP: 2001:67c:1360:8001::21 80]
W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/bionic-updates/main/dep11/icons-64x64.tar Connection failed [IP: 2001:67c:1360:8001::21 80]
W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/bionic-updates/main/dep11/icons-128x128.tar Could not connect to in.archive.ubuntu.com:80 (2001:67c:1562::19), connection timed out Could not connect to in.archive.ubuntu.com:80 (91.189.88.31), connection timed out Could not connect to in.archive.ubuntu.com:80 (2001:67c:1560:8001::14), connection timed out Could not connect to in.archive.ubuntu.com:80 (91.189.88.149), connection timed out Could not connect to in.archive.ubuntu.com:80 (2001:67c:1360:8001::17), connection timed out Could not connect to in.archive.ubuntu.com:80 (91.189.91.26), connection timed out Could not connect to in.archive.ubuntu.com:80 (2001:67c:1360:8001::21), connection timed out Could not connect to in.archive.ubuntu.com:80 (91.189.88.162), connection timed out Could not connect to in.archive.ubuntu.com:80 (2001:67c:1560:8001::11), connection timed out Could not connect to in.archive.ubuntu.com:80 (91.189.91.23), connection timed out Could not connect to in.archive.ubuntu.com:80 (91.189.88.24), connection timed out [IP: 2001:67c:1560:8001::11 80]
W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/bionic-updates/universe/binary-amd64/Packages.gz Unable to connect to in.archive.ubuntu.com:http: [IP: 2001:67c:1560:8001::11 80]
W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/bionic-updates/universe/binary-i386/Packages.gz Unable to connect to in.archive.ubuntu.com:http: [IP: 2001:67c:1560:8001::11 80]
W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/bionic-updates/universe/dep11/Components-amd64.yml.gz Unable to connect to in.archive.ubuntu.com:http: [IP: 2001:67c:1560:8001::11 80]
W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/bionic-updates/universe/dep11/icons-48x48.tar Unable to connect to in.archive.ubuntu.com:http: [IP: 2001:67c:1560:8001::11 80]
W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/bionic-updates/universe/dep11/icons-64x64.tar Unable to connect to in.archive.ubuntu.com:http: [IP: 2001:67c:1560:8001::11 80]
W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/bionic-updates/universe/dep11/icons-128x128.tar Unable to connect to in.archive.ubuntu.com:http: [IP: 2001:67c:1560:8001::11 80]
W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/bionic-updates/multiverse/dep11/Components-amd64.yml.gz Unable to connect to in.archive.ubuntu.com:http: [IP: 2001:67c:1560:8001::11 80]
W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/bionic-backports/universe/dep11/Components-amd64.yml Unable to connect to in.archive.ubuntu.com:http: [IP: 2001:67c:1560:8001::11 80]
W: Some index files failed to download. They have been ignored, or old ones used instead.
aayush@aayush-desktop-edu:~$
::1 ip6-allrouters
aayush-desktop-edu ip6-localhost
fe00::0 ip6-localnet
ff00::0 ip6-loopback
ff02::1 ip6-mcastprefix
ff02::2 localhost
ip6-allnodes
aayush@aayush-desktop-edu:~$ sd
sd: command not found
我知道我的网络连接很弱，导致命令无法更新软件列表，但此消息的最后几行包含 hosts 文件中的信息。我的系统中有恶意软件吗？为什么会出现这样的消息？
答案1
看起来不像。但有一件事可以让你检查，那就是运行 top 命令来查看是否有任何不寻常的进程正在运行。
top