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自从把这个主页对应的 repo 设置为 private，链接也就没法访问了，但是今天又心血来潮重新设置为 public，但是，并没有一键恢复，还是有些东西需要设置的，另外如何新增博客之前没记录，也忘得差不多了，因此呢，索性新建一个，作为博客重启的记录吧。

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最近打开 Cmder 总是会有弹窗提示没有安装 7zip 或者 winRar，它默认取得路径是 %ProgramFiles%\7-Zip\7zg.exe，这个看到没有啊，弱智吧

怎么修复呢？

Win+Alt+P 打开设置，切到 General - Update，看下图：

很明显路径不对，由于用 scoop 装过 7zip，将路径改一下好了："%SCOOP%/apps/7zip/current/7zg.exe" x -y "%1"

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今天在 24 上装软件遇到这个问题，经过搜索，解决这个问题：

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taseikyo@node ~> sai gcc make libncurses5-dev openssl libssl-dev 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
python3 is already the newest version (3.7.5-1).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] Y
Setting up python3 (3.7.5-1) ...
running python rtupdate hooks for python3.7...
dpkg-query: package 'rhythmbox-plugin-alternative-toolbar' is not installed
Use dpkg --contents (= dpkg-deb --contents) to list archive files contents.
Traceback (most recent call last):
  File "/usr/bin/py3clean", line 210, in <module>
    main()
  File "/usr/bin/py3clean", line 196, in main
    pfiles = set(dpf.from_package(options.package))
  File "/usr/share/python3/debpython/files.py", line 53, in from_package
    raise Exception("cannot get content of %s" % package_name)
Exception: cannot get content of rhythmbox-plugin-alternative-toolbar
error running python rtupdate hook rhythmbox-plugin-alternative-toolbar
dpkg-query: package 'rhythmbox-plugins' is not installed
Use dpkg --contents (= dpkg-deb --contents) to list archive files contents.
Traceback (most recent call last):
  File "/usr/bin/py3clean", line 210, in <module>
    main()
  File "/usr/bin/py3clean", line 196, in main
    pfiles = set(dpf.from_package(options.package))
  File "/usr/share/python3/debpython/files.py", line 53, in from_package
    raise Exception("cannot get content of %s" % package_name)
Exception: cannot get content of rhythmbox-plugins
error running python rtupdate hook rhythmbox-plugins
dpkg-query: package 'sosreport' is not installed
Use dpkg --contents (= dpkg-deb --contents) to list archive files contents.
Traceback (most recent call last):
  File "/usr/bin/py3clean", line 210, in <module>
    main()
  File "/usr/bin/py3clean", line 196, in main
    pfiles = set(dpf.from_package(options.package))
  File "/usr/share/python3/debpython/files.py", line 53, in from_package
    raise Exception("cannot get content of %s" % package_name)
Exception: cannot get content of sosreport
error running python rtupdate hook sosreport
dpkg-query: package 'streamlink' is not installed
Use dpkg --contents (= dpkg-deb --contents) to list archive files contents.
Traceback (most recent call last):
  File "/usr/bin/py3clean", line 210, in <module>
    main()
  File "/usr/bin/py3clean", line 196, in main
    pfiles = set(dpf.from_package(options.package))
  File "/usr/share/python3/debpython/files.py", line 53, in from_package
    raise Exception("cannot get content of %s" % package_name)
Exception: cannot get content of streamlink
error running python rtupdate hook streamlink
dpkg: error processing package python3 (--configure):
 installed python3 package post-installation script subprocess returned error exit status 4
Errors were encountered while processing:
 python3
E: Sub-process /usr/bin/dpkg returned an error code (1)

with similar output all around due to having rtupdate hooks for packages that were not installed on the system in /usr/share/python3/runtime.d.

Fixed by removing the <missing-package-name>.rtupdate files in the directory above and reinstalling python3.

将错误信息中的 xxx.rtupdate 从 /usr/share/python3/runtime.d 目录删除，然后重装 Python3 然后就好了。

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taseikyo@node ~> sai gcc make libncurses5-dev openssl libssl-dev 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
gcc is already the newest version (4:9.2.1-3.1ubuntu1).
libncurses5-dev is already the newest version (6.1+20190803-1ubuntu1).
libssl-dev is already the newest version (1.1.1c-1ubuntu4.1).
make is already the newest version (4.2.1-1.2).
openssl is already the newest version (1.1.1c-1ubuntu4.1).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

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最近学到了 Linux 可以通过 /etc/hosts.allow 和 /etc/hosts.deny 对远程访问进行控制。

How to allow an IP address for SSH connection?

  • Step 1 : SSH to server as root user.
  • Step 2 : Open /etc/hosts.allow file using your favorite text editor.

To allow one IP address to server:

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sshd : IP-Address

To allow more than one IP addresses:

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sshd : IP-Address1, IP-Address2, IP-Address3

To allow IP ranges:

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sshd : 33.*.*.*
sshd : 66.66.*.*

To allow all IP addresses for SSH:

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sshd : ALL

Or

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ALL : ALL

We can also control the same from /etc/hosts.deny file by adding the keyword “ALLOW.” See the example pasted below:

Example:

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# vim /etc/hosts.deny

sshd : ALL : ALLOW

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今天在 node24 安装 streamlink 时安装不上，提示添加 –fix-missing 加上还是不行，想着是不是因为太久没更新的缘故试了下 update：

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tian@node24 ~/D> sau
Ign:1 https://mirrors.tuna.tsinghua.edu.cn/ubuntu eoan InRelease
Ign:2 https://mirrors.tuna.tsinghua.edu.cn/ubuntu eoan-updates InRelease
Ign:3 https://mirrors.tuna.tsinghua.edu.cn/ubuntu eoan-backports InRelease
Ign:4 https://mirrors.tuna.tsinghua.edu.cn/ubuntu eoan-security InRelease
Ign:5 https://mirrors.tuna.tsinghua.edu.cn/ubuntu eoan-proposed InRelease
Err:6 https://mirrors.tuna.tsinghua.edu.cn/ubuntu eoan Release
  404  Not Found [IP: 101.6.8.193 443]
Err:7 https://mirrors.tuna.tsinghua.edu.cn/ubuntu eoan-updates Release
  404  Not Found [IP: 101.6.8.193 443]
Err:8 https://mirrors.tuna.tsinghua.edu.cn/ubuntu eoan-backports Release
  404  Not Found [IP: 101.6.8.193 443]
Err:9 https://mirrors.tuna.tsinghua.edu.cn/ubuntu eoan-security Release
  404  Not Found [IP: 101.6.8.193 443]
Err:10 https://mirrors.tuna.tsinghua.edu.cn/ubuntu eoan-proposed Release                       
  404  Not Found [IP: 101.6.8.193 443]
Hit:11 http://packages.microsoft.com/repos/vscode stable InRelease                                        
Hit:13 http://dk.archive.ubuntu.com/ubuntu xenial InRelease                                               
Ign:12 http://www.analizo.org/download ./ InRelease
Get:14 http://www.analizo.org/download ./ Release [2,740 B]
Reading package lists... Done       
E: The repository 'https://mirrors.tuna.tsinghua.edu.cn/ubuntu eoan Release' no longer has a Release file.
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.
E: The repository 'https://mirrors.tuna.tsinghua.edu.cn/ubuntu eoan-updates Release' no longer has a Release file.
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.
E: The repository 'https://mirrors.tuna.tsinghua.edu.cn/ubuntu eoan-backports Release' no longer has a Release file.
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.
E: The repository 'https://mirrors.tuna.tsinghua.edu.cn/ubuntu eoan-security Release' no longer has a Release file.
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.
E: The repository 'https://mirrors.tuna.tsinghua.edu.cn/ubuntu eoan-proposed Release' no longer has a Release file.
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.

开始直接想着是源坏掉了于是换成了阿里源，结果还是不行，于是搜这个错误，搜到 CSDN 这个博客：https://blog.csdn.net/jh_luchi/article/details/102812031

按照他的方法果然解决了：

1.在官网源 https://mirrors.ustc.edu.cn/repogen/ 下载对应版本最新的源

虽然 19.10 提示说已经过期，但我还是直接复制粘贴到 /etc/apt/sources.list

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deb https://mirrors.ustc.edu.cn/ubuntu-old-releases/ubuntu/ eoan main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu-old-releases/ubuntu/ eoan main restricted universe multiverse

deb https://mirrors.ustc.edu.cn/ubuntu-old-releases/ubuntu/ eoan-security main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu-old-releases/ubuntu/ eoan-security main restricted universe multiverse

deb https://mirrors.ustc.edu.cn/ubuntu-old-releases/ubuntu/ eoan-updates main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu-old-releases/ubuntu/ eoan-updates main restricted universe multiverse

deb https://mirrors.ustc.edu.cn/ubuntu-old-releases/ubuntu/ eoan-backports main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu-old-releases/ubuntu/ eoan-backports main restricted universe multiverse

编辑完保存，update 没报错，继续安装也是没问题，好耶！

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其实在自己电脑上转化没什么问题，两三分钟就完事了，在实验室电脑一直有问题，之前就因为找不到问题去 GitHub 的 issue 页面留言过（相当多人遇到这个问题），今天再次升级，报了具体错，搜了一下解决了。

过程如下，在变更过程中报错：由于虚拟磁盘系统限制，无法完成请求的操作。虚拟硬盘文件必须是未压缩和未加密的文件，并且不能是稀疏文件。

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tian :: ~ » wsl -l -v
  NAME                   STATE           VERSION
* Ubuntu-20.04           Running         1
  docker-desktop-data    Stopped         2
  docker-desktop         Stopped         2
tian :: ~ » wsl --shutdown
tian :: ~ » wsl --set-version Ubuntu-20.04 2
正在进行转换，这可能需要几分钟时间...
有关与 WSL 2 的主要区别的信息，请访问 https://aka.ms/wsl2
由于虚拟磁盘系统限制，无法完成请求的操作。虚拟硬盘文件必须是未压缩和未加密的文件，并且不能是稀疏文件。

搜到一个 CSDN 博客，它主要将 SpringBoot 的坑，顺便提到这个错，结果真有效。

方法是将 Linux 安装目录（C:\Users\tian\AppData\Local\Packages\CanonicalGroupLimited.Ubuntu20.04onWindows_79rhkp1fndgsc）的 LocalState 文件夹的压缩节省空间去掉，注意这里不用选及其子目录，只用这一个目录即可。

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tian :: ~ » wsl --set-version Ubuntu-20.04 2
正在进行转换，这可能需要几分钟时间...
有关与 WSL 2 的主要区别的信息，请访问 https://aka.ms/wsl2
转换完成。

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今天用 vscode 写论文，有个表格，于是从给出的模板后面 copy 了表格的代码，稍作修改，然后 ctrl+s 开始 build，结果几分钟过去了一直卡在 build，于是我换了一个 build 的 recipe（侧边栏的 TEX 按钮 - COMMANDS - Build LaTex project），一共有 4 个，我挨个试了个遍都是一样的结果，我：？

我以为是 xelatex 这个程序出问题了，因为是之前安装 texlive2018，于是用 scoop 重新装了，结果依然会卡在 build。我就迷惑了，哪里出问题了，于是直接把文件代码贴到 overleaf 网站上，结果由于长时间编译不出来报错了，说是有语法错。。。我人傻了，vscode 咋没有报错？

表格代码如下，目前并不懂哪里出错了 :O

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Table~\ref{tab1} lists the comparison.

\begin{table}
  \begin{tabular}{lll}
    \caption{Comparison between A, B and C}
    \label{tab1}
    \toprule
    Virtualization Technology&Pros&Cons\\
    \midrule
    As & Allows deploying different operating systems on a single host & For Swedish names\\
    Bs & 1 in 5& Common in math\\
    Cs & 4 in 5 & Used in business\\
  \bottomrule
\end{tabular}
\end{table}