have no use:
a@a-MBX-CHT2:~$ sudo apt-get update
[sudo] password for a:
Get:1
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty InRelease [243 kB]
Get:2
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-updates InRelease [89.2 kB]
Get:3
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-backports InRelease [89.2 kB]
Get:4
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-security InRelease [89.2 kB]
Ign:1
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty InRelease
Get:6
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty/main i386 Packages [1,204 kB]
Get:5
http://archive.canonical.com/ubuntu zesty InRelease [10.2 kB]
Ign:2
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-updates InRelease
Ign:3
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-backports InRelease
Get:7
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty/main amd64 Packages [1,207 kB]
Ign:4
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-security InRelease
Ign:5
http://archive.canonical.com/ubuntu zesty InRelease
Get:8
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty/main Translation-en [577 kB]
Get:9
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty/main amd64 DEP-11 Metadata [536 kB]
Get:10
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty/main DEP-11 64x64 Icons [373 kB]
Get:11
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty/restricted amd64 Packages [8,672 B]
Get:12
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty/restricted i386 Packages [8,648 B]
Get:13
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty/restricted Translation-en [2,724 B]
Get:14
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty/restricted amd64 DEP-11 Metadata [185 B]
Get:15
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty/universe i386 Packages [8,037 kB]
Get:16
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty/universe amd64 Packages [8,068 kB]
Get:17
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty/universe Translation-en [4,671 kB]
Get:18
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty/universe amd64 DEP-11 Metadata [2,713 kB]
Get:19
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty/universe DEP-11 64x64 Icons [7,842 kB]
Get:20
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty/multiverse amd64 Packages [154 kB]
Get:21
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty/multiverse i386 Packages [147 kB]
Get:22
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty/multiverse Translation-en [109 kB]
Get:23
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty/multiverse amd64 DEP-11 Metadata [43.3 kB]
Get:24
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty/multiverse DEP-11 64x64 Icons [207 kB]
Get:25
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-updates/main i386 Packages [94.4 kB]
Get:26
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-updates/main amd64 Packages [96.2 kB]
Get:27
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-updates/main Translation-en [43.0 kB]
Get:28
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-updates/main amd64 DEP-11 Metadata [41.8 kB]
Get:29
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-updates/main DEP-11 64x64 Icons [14.0 kB]
Get:30
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-updates/restricted amd64 Packages [2,168 B]
Get:31
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-updates/restricted i386 Packages [2,156 B]
Get:32
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-updates/restricted Translation-en [1,280 B]
Get:33
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-updates/restricted amd64 DEP-11 Metadata [193 B]
Get:34
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-updates/universe i386 Packages [53.6 kB]
Get:35
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-updates/universe amd64 Packages [53.7 kB]
Get:36
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-updates/universe Translation-en [31.2 kB]
Get:37
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-updates/universe amd64 DEP-11 Metadata [54.1 kB]
Get:38
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-updates/universe DEP-11 64x64 Icons [43.5 kB]
Get:39
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-updates/multiverse amd64 Packages [4,172 B]
Get:40
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-updates/multiverse i386 Packages [4,320 B]
Get:41
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-updates/multiverse Translation-en [2,168 B]
Get:42
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-updates/multiverse amd64 DEP-11 Metadata [2,464 B]
Get:43
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-updates/multiverse DEP-11 64x64 Icons [2,638 B]
Get:44
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-backports/main i386 Packages [1,480 B]
Get:45
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-backports/main amd64 Packages [1,480 B]
Get:46
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-backports/main Translation-en [664 B]
Get:47
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-backports/main amd64 DEP-11 Metadata [208 B]
Get:48
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-backports/main DEP-11 64x64 Icons [29 B]
Get:49
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-backports/restricted amd64 DEP-11 Metadata [194 B]
Get:50
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-backports/universe amd64 Packages [2,720 B]
Get:51
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-backports/universe i386 Packages [2,724 B]
Get:52
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-backports/universe Translation-en [1,176 B]
Get:53
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-backports/universe amd64 DEP-11 Metadata [3,976 B]
Get:54
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-backports/universe DEP-11 64x64 Icons [2,715 B]
Get:55
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-backports/multiverse amd64 DEP-11 Metadata [212 B]
Get:56
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-backports/multiverse DEP-11 64x64 Icons [29 B]
Get:57
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-security/main i386 Packages [65.5 kB]
Get:58
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-security/main amd64 Packages [67.0 kB]
Get:59
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-security/main Translation-en [29.6 kB]
Get:60
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-security/main amd64 DEP-11 Metadata [5,808 B]
Get:61
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-security/main DEP-11 64x64 Icons [5,289 B]
Get:62
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-security/restricted i386 Packages [2,156 B]
Get:63
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-security/restricted amd64 Packages [2,168 B]
Get:64
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-security/restricted Translation-en [1,280 B]
Get:65
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-security/restricted amd64 DEP-11 Metadata [192 B]
Get:66
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-security/universe i386 Packages [28.7 kB]
Get:67
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-security/universe amd64 Packages [28.8 kB]
Get:68
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-security/universe Translation-en [19.9 kB]
Get:69
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-security/universe amd64 DEP-11 Metadata [5,040 B]
Get:70
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-security/universe DEP-11 64x64 Icons [11.8 kB]
Get:71
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-security/multiverse i386 Packages [1,972 B]
Get:72
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-security/multiverse amd64 Packages [1,820 B]
Get:73
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-security/multiverse Translation-en [1,020 B]
Get:74
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-security/multiverse amd64 DEP-11 Metadata [208 B]
Get:75
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-security/multiverse DEP-11 64x64 Icons [29 B]
Fetched 36.8 MB in 1min 35s (387 kB/s)
Reading package lists... Done
W: GPG error:
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3B4FE6ACC0B21F32
W: The repository '
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error:
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-updates InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3B4FE6ACC0B21F32
W: The repository '
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-updates InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error:
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-backports InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3B4FE6ACC0B21F32
W: The repository '
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-backports InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error:
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-security InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3B4FE6ACC0B21F32
W: The repository '
http://mirrors.tuna.tsinghua.edu.cn/ubuntu zesty-security InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error:
http://archive.canonical.com/ubuntu zesty InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3B4FE6ACC0B21F32
W: The repository '
http://archive.canonical.com/ubuntu zesty InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
a@a-MBX-CHT2:~$ sudo apt-get install kernel-package
Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run 'apt --fix-broken install' to correct these.
The following packages have unmet dependencies:
kernel-package : Depends: xmlto
Recommends: docbook-utils but it is not going to be installed
Recommends: uboot-mkimage but it is not installable
Recommends: kernel-common but it is not going to be installed
E: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution).
a@a-MBX-CHT2:~$ sudo apt-get --no-install-recommends install kernel-package
Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run 'apt --fix-broken install' to correct these.
The following packages have unmet dependencies:
kernel-package : Depends: xmlto
E: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution).