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Evan Carroll's questions

Martin Hope
Evan Carroll
Asked: 2018-07-15 12:03:36 +0800 CST
  • 3

我只是想了解这里的发布过程，

这意味着 MariaDB 10.2 的通用版本比18.04 的功能冻结早了11 个月。为什么 10.2 没有进入 18.04？

我知道我可以拿到包，我想具体了解 Canonical 的维护政策，尤其是上游支持 MariaDB 10.1 到 2020 年 10 月，而 Ubuntu 18.04 支持到 2023 年 4 月（这意味着我相信 Canonical 支持 MariaDB 2.5 年以上）比 MariaDB 本身打算支持它）。

release-management 18.04 mariadb
Martin Hope
Evan Carroll
Asked: 2017-12-15 12:50:00 +0800 CST
  • 3

因为 PPA 没有真正的错误跟踪器，而且维护得很差，我想我只想在这里问如何解决这个问题。

vlc-masterlibvlccore9 PPA中的包正在尝试安装，它应该由./usr/lib/x86_64-linux-gnu/libvlccore.so.9.0.0libvlccore8

Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  libodbcinstq4-1 vlc-bin vlc-l10n vlc-plugin-notify vlc-plugin-qt vlc-plugin-samba vlc-plugin-skins2 vlc-plugin-video-splitter vlc-plugin-visualization
Use 'sudo apt autoremove' to remove them.
The following NEW packages will be installed:
  libvlccore9
0 upgraded, 1 newly installed, 0 to remove and 2 not upgraded.
34 not fully installed or removed.
Need to get 470 kB of archives.
After this operation, 1,243 kB of additional disk space will be used.
Get:1 http://ppa.launchpad.net/videolan/master-daily/ubuntu artful/main amd64 libvlccore9 amd64 3.0.0~rc1~~git20171213+r73247+108~ubuntu17.10.1 [470 kB]
Fetched 470 kB in 1s (279 kB/s)      
(Reading database ... 322201 files and directories currently installed.)
Preparing to unpack .../libvlccore9_3.0.0~rc1~~git20171213+r73247+108~ubuntu17.10.1_amd64.deb ...
Unpacking libvlccore9:amd64 (3.0.0~rc1~~git20171213+r73247+108~ubuntu17.10.1) ...
dpkg: error processing archive /var/cache/apt/archives/libvlccore9_3.0.0~rc1~~git20171213+r73247+108~ubuntu17.10.1_amd64.deb (--unpack):
 trying to overwrite '/usr/lib/x86_64-linux-gnu/libvlccore.so.9.0.0', which is also in package libvlccore8:amd64 3.0.0~~git20171208+r73126+99~ubuntu17.10.1
dpkg-deb: error: subprocess paste was killed by signal (Broken pipe)
Errors were encountered while processing:
 /var/cache/apt/archives/libvlccore9_3.0.0~rc1~~git20171213+r73247+108~ubuntu17.10.1_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

问题是为什么，libvlccore8 没有显示该文件，

apt-file show libvlccore8
libvlccore8: /usr/lib/x86_64-linux-gnu/libvlccore.so.8
libvlccore8: /usr/lib/x86_64-linux-gnu/libvlccore.so.8.0.0
libvlccore8: /usr/share/bug/libvlccore8/control
libvlccore8: /usr/share/bug/libvlccore8/presubj
libvlccore8: /usr/share/doc/libvlccore8/NEWS.Debian.gz
libvlccore8: /usr/share/doc/libvlccore8/changelog.Debian.gz
libvlccore8: /usr/share/doc/libvlccore8/copyright

我有一个libvlccore8

dpkg -l | grep -i libvlccore
rc  libvlccore7                                   2.1.6-0ubuntu14.04.1                            amd64        base library for VLC and its modules
ii  libvlccore8:amd64                             3.0.0~~git20171208+r73126+99~ubuntu17.10.1      amd64        base library for VLC and its modules

但我什至不能在当前状态下删除它，

sudo apt-get --purge remove libvlccore8
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:
 libvlc5 : Depends: libvlccore9 (>= 3.0.0~rc1~~git20171213+r73247+108~ubuntu17.10.1~) but it is not going to be installed
 phonon4qt5-backend-vlc : Depends: libvlccore8 (>= 2.0.0) but it is not going to be installed
 vlc-plugin-base : Depends: libvlccore9 (>= 3.0.0~rc1~~git20171213+r73247+108~ubuntu17.10.1~) but it is not going to be installed
                   Depends: vlc-plugin-abi-4-0-0
 vlc-plugin-notify : Depends: libvlccore9 (>= 3.0.0~rc1~~git20171213+r73247+108~ubuntu17.10.1~) but it is not going to be installed
                     Depends: vlc-plugin-abi-4-0-0
 vlc-plugin-qt : Depends: libvlccore9 (>= 3.0.0~rc1~~git20171213+r73247+108~ubuntu17.10.1~) but it is not going to be installed
                 Depends: vlc-plugin-abi-4-0-0
 vlc-plugin-samba : Depends: libvlccore9 (>= 3.0.0~rc1~~git20171213+r73247+108~ubuntu17.10.1~) but it is not going to be installed
                    Depends: vlc-plugin-abi-4-0-0
 vlc-plugin-skins2 : Depends: libvlccore9 (>= 3.0.0~rc1~~git20171213+r73247+108~ubuntu17.10.1~) but it is not going to be installed
                     Depends: vlc-plugin-abi-4-0-0
 vlc-plugin-video-output : Depends: libvlccore8 (= 3.0.0~~git20171208+r73126+99~ubuntu17.10.1) but it is not going to be installed
 vlc-plugin-video-splitter : Depends: libvlccore9 (>= 3.0.0~rc1~~git20171213+r73247+108~ubuntu17.10.1~) but it is not going to be installed
                             Depends: vlc-plugin-abi-4-0-0
 vlc-plugin-visualization : Depends: libvlccore9 (>= 3.0.0~rc1~~git20171213+r73247+108~ubuntu17.10.1~) but it is not going to be installed
                            Depends: vlc-plugin-abi-4-0-0
E: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution).

而且，我无法运行--fix-broken install，因为它试图做同样的事情失败了......

apt-get --fix-broken install
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Correcting dependencies... Done
The following packages were automatically installed and are no longer required:
  libodbcinstq4-1 vlc-bin vlc-l10n vlc-plugin-notify vlc-plugin-qt vlc-plugin-samba vlc-plugin-skins2 vlc-plugin-video-splitter vlc-plugin-visualization
Use 'sudo apt autoremove' to remove them.
The following additional packages will be installed:
  libvlccore9
The following NEW packages will be installed:
  libvlccore9
0 upgraded, 1 newly installed, 0 to remove and 3 not upgraded.
34 not fully installed or removed.
Need to get 0 B/470 kB of archives.
After this operation, 1,243 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
(Reading database ... 322201 files and directories currently installed.)
Preparing to unpack .../libvlccore9_3.0.0~rc1~~git20171213+r73247+108~ubuntu17.10.1_amd64.deb ...
Unpacking libvlccore9:amd64 (3.0.0~rc1~~git20171213+r73247+108~ubuntu17.10.1) ...
dpkg: error processing archive /var/cache/apt/archives/libvlccore9_3.0.0~rc1~~git20171213+r73247+108~ubuntu17.10.1_amd64.deb (--unpack):
 trying to overwrite '/usr/lib/x86_64-linux-gnu/libvlccore.so.9.0.0', which is also in package libvlccore8:amd64 3.0.0~~git20171208+r73126+99~ubuntu17.10.1
dpkg-deb: error: subprocess paste was killed by signal (Broken pipe)
Errors were encountered while processing:
 /var/cache/apt/archives/libvlccore9_3.0.0~rc1~~git20171213+r73247+108~ubuntu17.10.1_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
package-management
Martin Hope
Evan Carroll
Asked: 2017-06-14 12:10:01 +0800 CST
  • 4

Redhat 在他们的一些文档中说

页面缓存是一种磁盘缓存，它保存文件和可执行程序的数据，例如具有文件或块设备的实际内容的页面。页面缓存（disk cache）用于减少磁盘读取次数。要控制 Red Hat Enterprise Linux 5 中用于页面缓存的总内存百分比，请更改 pagecache 内核参数。百分比越低，系统越倾向于回收未映射的页面缓存内存而不是映射内存。不建议对数据库使用高值（如默认值 100）。

它指向/proc/sys/vm/pagecache更改该值。

我想知道在Ubuntu中叫什么？

proc
Martin Hope
Evan Carroll
Asked: 2017-05-15 10:16:17 +0800 CST
  • 14

如果我想使用 apt 安装 VLC，我可以运行

apt-cache show vlc | grep -i version
Version: 2.2.4-14ubuntu2

这将告诉我 apt 将引入的版本。Snap 目前在其存储库中具有 VLC 3.x。我如何在不将其拉下并安装的情况下看到它？

snap
Martin Hope
Evan Carroll
Asked: 2017-05-01 09:57:09 +0800 CST
  • 0

当我尝试使用以下命令通过 Linux 上的启动器启动 Signal 时

/usr/bin/chromium-browser --profile-directory=Default --app-id=bikioccmkafdpakkkcpdbppfkghcmihk

它崩溃了，什么也没有发生。这就是桌面应用程序链接所调用的内容。但是当我点击LAUNCH APP网上商店时，它可以工作。

任何关于网上商店的LAUNCH APP链接如何工作或有什么责任的想法。我在开发人员的控制台中看不到任何错误。

xubuntu
Martin Hope
Evan Carroll
Asked: 2017-04-19 19:31:17 +0800 CST
  • 11

我在 Ubuntu Zesty 中安装 VLC 3.0 时遇到了困难。使用官方 PPA。我添加它使用

sudo add-apt-repository ppa:videolan/master-daily
sudo apt-get update

apt-cache show并列出来，

apt-cache show vlc | grep Version
Version: 3.0.0~~git20160813+r65787+62~ubuntu16.04.1
Version: 2.2.4-14ubuntu2

但是当我尝试安装3.0.0时，sudo apt-get install vlc=3.*我得到了，

sudo apt-get install vlc=3.*
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Selected version '3.0.0~~git20160813+r65787+62~ubuntu16.04.1' ( [amd64]) for 'vlc'
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:
 vlc : Depends: vlc-nox (= 3.0.0~~git20160813+r65787+62~ubuntu16.04.1) but it is not going to be installed
       Depends: libavcodec-ffmpeg56 (>= 7:2.6) but it is not installable or
                libavcodec-ffmpeg-extra56 (>= 7:2.6) but it is not installable
       Depends: libgles1-mesa (>= 7.8.1) or
                libgles1
       Recommends: vlc-plugin-notify (= 3.0.0~~git20160813+r65787+62~ubuntu16.04.1) but it is not going to be installed
       Recommends: vlc-plugin-samba (= 3.0.0~~git20160813+r65787+62~ubuntu16.04.1) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

是否有另一个 PPA 在 Ubuntu Zesty 中提供 VLC 3.0？好像是libavcodec-ffmpeg56改名了，

$ apt-cache search libavcodec ffmpeg
libavcodec-extra57 - FFmpeg library with additional de/encoders for audio/video codecs

现在 vlc-3.* 需要针对新库 (libavcodec-extra57) 构建，并从旧名称 (libavcodec-ffmpeg-extra56) 更新其清单

我也不能为此提交错误，因为 Launchpad 不支持该错误。我所能做的就是使用我所做的 Launchpad 联系论坛编写维护者。没有回音。

ppa
Martin Hope
Evan Carroll
Asked: 2016-12-26 12:25:55 +0800 CST
  • 0

当我尝试在 Ubuntu 16.10 上运行 fiji 时，我得到

Java HotSpot(TM) 64-Bit Server VM warning: ignoring option PermSize=128m; support was removed in 8.0
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release
Error occurred during initialization of VM
java/lang/NoClassDefFoundError: java/lang/Object

我猜真正的错误是

java/lang/NoClassDefFoundError: java/lang/Object

我该如何解决。我正在使用安装的 Java

$ java -v
openjdk version "1.8.0_111"
OpenJDK Runtime Environment (build 1.8.0_111-8u111-b14-2ubuntu0.16.10.2-b14)
OpenJDK 64-Bit Server VM (build 25.111-b14, mixed mode)
java
Martin Hope
Evan Carroll
Asked: 2015-11-12 16:21:06 +0800 CST
  • 4

我正在尝试重新安装 MySQL，但目前无法连接。我不知道问题出在哪里，也不知道如何重设密码。目前，我不断得到，

mysqladmin: connect to server at 'localhost' failed
error: 'Access denied for user 'root'@'localhost' (using password: NO)'

这是我的版本

# mysql -v    
Server version: 5.6.27-0ubuntu1 (Ubuntu)

我正在使用 Ubuntu 15.04。

password
Martin Hope
Evan Carroll
Asked: 2014-10-31 22:30:19 +0800 CST
  • 1

由于一些愚蠢的原因，Ubuntu 14.10 现在正在填满/tmp文件。有数百万。

dmesg向我展示了数千行这样的内容，

[15686.146977] ecryptfs_create: Failed to create file inlower filesystem
[15686.376336] ecryptfs_do_create: Failure to create dentry in lower fs; rc =

最终，我必须从记忆棒启动并运行rm -rf /tmp并自己重新创建它。这个问题的原因是什么？我升级了系统，它工作了一点。然后它给我带来了问题，当我重新启动时，我遇到了很多错误。我花了一段时间才找到它，但这似乎不是一次性的。现在我的磁盘已满，由于所有这些临时文件，我无法执行任何写入磁盘的操作。

更新

有趣的是，中的所有文件/tmp都有一个 cups ppd 文件的内容......

*PPD-Adobe: "4.3"
*% ===============================================
*% Disclaimer:  The above statement indicates
*% that this PPD was written using the Adobe PPD
*% File Format Specification 4.3, but does not
*% intend to imply approval and acceptance by
*% Adobe Systems, Inc.
*% ===============================================
*%
*% ===============================================
*% PPD for Samsung M262x 282x Series CUPS
*% For Linux Only
*% ===============================================

（文件在这里被截断）。

此外/var/log/cups/error_log，我有很多这样的条目......

E [timestamp] Unable to create "/var/cache/cups/job.cache.N": No space left on device
E [timestamp[ Unable to create "/var/spool/cups/c00196.N": No space left on device
E [timestamp] Unable to create "/etc/cups/subscriptions.conf.N": No space left on device
E [timestamp] Unable to create "/var/cache/cups/job.cache.N": No space left on device
E [timestamp] Unable to create "/var/spool/cups/c00196.N": No space left on device

在进一步检查中，我可以看到这些都是指向同一个 ppd 文件的符号链接。

find . -not -type d -exec ls -al {} \;
./5452f859dd8ec -> /etc/cups/ppd/Samsung-M262x-282x-Series.ppd
./5452fb4f958b3 -> /etc/cups/ppd/Samsung-M262x-282x-Series.ppd
./5452fa54e4d05 -> /etc/cups/ppd/Samsung-M262x-282x-Series.ppd
./5452f4b801d88 -> /etc/cups/ppd/Samsung-M262x-282x-Series.ppd
printing