Arya Sadeghi's questions

我已经尝试过sudo apt-get install g++，但我遇到了以下错误：

Reading package lists... Done
Building dependency tree        Reading state information... Done 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:  g++: Depends: g++-7
(>= 7.2.0-1~) but it is not going to be installed E: Unable to correct
problems, you have held broken packages.

我应该如何解决这个问题？

我想在 Ubuntu 17.10 上安装 playonlinux，我看到了这个问题及其答案，但是在sudo apt-get install playonlinux我收到以下错误之后：

Reading package lists... Done
Building dependency tree       
Reading state information... Done
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:
 playonlinux : Depends: curl
E: Unable to correct problems, you have held broken package

我能做些什么来解决这个问题并安装 playonlinux？

sudo apt-get 更新：

arya@arya:~$ sudo apt-get update
Get:1 http://ppa.launchpad.net/noobslab/apps/ubuntu artful InRelease [15.4 kB] 
Ign:2 http://dl.google.com/linux/chrome/deb stable InRelease                   
Hit:3 http://archive.ubuntu.com/ubuntu artful InRelease                      
Hit:4 http://dl.google.com/linux/chrome/deb stable Release                     
Get:6 http://ppa.launchpad.net/noobslab/apps/ubuntu artful/main i386 Packages [1,572 B]
Get:7 http://ppa.launchpad.net/noobslab/apps/ubuntu artful/main amd64 Packages [1,560 B]
Get:8 http://ppa.launchpad.net/noobslab/apps/ubuntu artful/main Translation-en [1,160 B]
Fetched 19.7 kB in 4s (4,087 B/s)               
Reading package lists... Done

sudo apt-get upgarde ：

arya@arya:~$ sudo apt-get upgrade
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

apt policy playonlinux curl libcurl3：

arya@arya:~$ apt policy playonlinux curl libcurl3
playonlinux:
  Installed: (none)
  Candidate: 4.2.12-1
  Version table:
     4.2.12-1 500
        500 http://archive.ubuntu.com/ubuntu artful/multiverse amd64 Packages
        500 http://archive.ubuntu.com/ubuntu artful/multiverse i386 Packages
curl:
  Installed: (none)
  Candidate: 7.55.1-1ubuntu2
  Version table:
     7.55.1-1ubuntu2 500
        500 http://archive.ubuntu.com/ubuntu artful/main amd64 Packages
libcurl3:
  Installed: 7.55.1-1ubuntu2.3
  Candidate: 7.55.1-1ubuntu2.3
  Version table:
 *** 7.55.1-1ubuntu2.3 100
         100 /var/lib/dpkg/status
     7.55.1-1ubuntu2 500
        500 http://archive.ubuntu.com/ubuntu artful/main amd64 Packages

我在 askubuntu 上找到了一个过时的安装 Adob​​e Reader 的解决方案。

我遵循了这些步骤，但是在使用更新我的源之后，sudo apt-get update我收到了以下错误：

Hit:1 http://archive.ubuntu.com/ubuntu artful InRelease
Ign:2 http://archive.canonical.com precise InRelease
Get:4 http://archive.canonical.com precise Release [8,180 B]            

Get:5 http://archive.canonical.com precise Release.gpg [198 B]
Ign:5 http://archive.canonical.com precise Release.gpg   
Ign:3 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:6 http://dl.google.com/linux/chrome/deb stable Release
Reading package lists... Done
W: GPG error: http://archive.canonical.com precise Release: The 
following signatures were invalid: 
630239CC130E1A7FD81A27B140976EAF437D05B5
E: The repository 'http://archive.canonical.com precise Release' is 
not signed.
N: Updating from such a repository can't be done securely, and is 
therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user 
configuration details.

我可以做些什么来解决这个问题并安装 Adob​​e Acrobat？

这个问题本身实际上并不是重复的，因为 OP 想要安装 Adob​​e Acrobat 并且旧的解决方案已经过时了。