安装php 7.2.19的时候出错，麻烦大神看下？
configure: error: libxml2 not found. Please check your libxml2 installation.报错内容上看是libxml2，可是我执行apt-get install libxml2-dev 之后，显示已经安装了的
Get:14 http://mirrors.aliyun.com/ubuntu bionic-security/universe amd64 Packages
Get:15 http://mirrors.aliyun.com/ubuntu bionic-security/universe Translation-en
Get:15 http://mirrors.aliyun.com/ubuntu bionic-security/universe Translation-en
Get:15 http://mirrors.aliyun.com/ubuntu bionic-security/universe Translation-en
Ign:15 http://mirrors.aliyun.com/ubuntu bionic-security/universe Translation-en
Get:15 http://mirrors.aliyun.com/ubuntu bionic-security/universe Translation-en
Err:15 http://mirrors.aliyun.com/ubuntu bionic-security/universe Translation-en
File has unexpected size (188912 != 189156). Mirror sync in progress?
Hashes of expected file:
- Filesize:189156
- SHA256:0fe1f995cae1b727674d458c007585c17aa710f9b94b8ff020e0e08dfccefeea
- SHA1:a159adb152e1076eea1e6b23baefedd7e078b4a2
- MD5Sum:f2b510fd8057610d673e748dfe86f442
Release file created at: Tue, 06 Aug 2019 17:09:49 +0000
Err:19 http://packages.microsoft.com/repos/vscode stable InRelease
Could not connect to packages.microsoft.com:80 (13.76.190.189), connection timed out
Reading package lists...
W: Failed to fetch http://packages.microsoft.com/repos/vscode/dists/stable/InReleaseCould not connect to packages.microsoft.com:80 (13.76.190.189), connection timed out
E: Failed to fetch http://mirrors.aliyun.com/ubuntu/dists/bionic-security/universe/i18n/Translation-en.xzFile has unexpected size (188912 != 189156). Mirror sync in progress?
Hashes of expected file:
- Filesize:189156
- SHA256:0fe1f995cae1b727674d458c007585c17aa710f9b94b8ff020e0e08dfccefeea
- SHA1:a159adb152e1076eea1e6b23baefedd7e078b4a2
- MD5Sum:f2b510fd8057610d673e748dfe86f442
Release file created at: Tue, 06 Aug 2019 17:09:49 +0000
W: Some index files failed to download. They have been ignored, or old ones used instead.
Reading package lists...
Building dependency tree...
Reading state information...
libc-ares-dev is already the newest version (1.14.0-1).
0 upgraded, 0 newly installed, 0 to remove and 18 not upgraded.
Reading package lists...
Building dependency tree...
Reading state information...
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
libicu-dev : Depends: libicu-le-hb-dev but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
Reading package lists...
Building dependency tree...
Reading state information...
e2fsprogs is already the newest version (1.44.1-1ubuntu1.1).
0 upgraded, 0 newly installed, 0 to remove and 18 not upgraded.
Reading package lists...
Building dependency tree...
Reading state information...
No apt package "libxslt", but there is a snap with that name.
Try "snap install libxslt"
E: Unable to locate package libxslt
Reading package lists...
Building dependency tree...
Reading state information...
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
libxslt1-dev : Depends: libxml2-dev (>= 2.6.26) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
Reading package lists...
Building dependency tree...
Reading state information...
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
libc-client2007e-dev : Depends: libssl-dev but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
按日志看你系统依赖包关系有问题，都报错了，你执行上面的命令肯定是安装不上的
可以尝试使用 aptitude install 日志中报错的软件依赖包进行修复
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