# pwndbg installation problems
## Normal Installation
```bash
$ git clone https://github.com/pwndbg/pwndbg
$ cd pwndbg
$ ./setup.sh
```
## Problem I
```bash!
The following information may help to resolve the situation:
The following packages have unmet dependencies:
python3-venv : Depends: python3.8-venv (>= 3.8.2-1~) but it is not going to be installed
Depends: python3 (= 3.8.2-0ubuntu2) but 3.10.4-0ubuntu2 is to be installed
E: Unable to correct problems, you have held broken packages.
```
1. 如果遇到這種的問題，就直接分析setup.sh是crash在哪邊，照理說應該是跟python的版本有關係，想我的狀況是原本安裝python3的version是3.10，而不是3.8，所以最直接的做法是修改setup.sh file，在第23行的地方修改一下，直接指定安裝的版本，另外
```bash=22
# original
sudo apt-get install -y git gdb gdbserver python3-dev python3-venv python3-pip python3-setuptools libglib2.0-dev libc6-dbg
```
```bash=22
# revised
sudo apt-get install -y git gdb gdbserver python3-dev=3.8.2-0ubuntu2 python3-venv=3.8.2-0ubuntu2 python3-pip python3-setuptools libglib2.0-dev libc6-dbg
```
* 另外如果gdb吃的python版本不是3.8，就需要直接指定，也就是在第172行的地方新增版本
```bash=172
$ PYVER=$(gdb -batch -q --nx -ex 'pi import platform; print(".".join(platform.python_version_tuple()[:2]))')
$ PYVER="3.8" # 直接指定，上面那行不要刪掉
```
然後安裝python3.8
```bash
$ sudo apt install python3.8
```
* 如果還是不行就強制把python3的版本改成3.8[^alter_python_version_on_ubuntu]
```bash
$ sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.8 1
```
此時應該會看到`dpkg -l|grep python`中，python3的結果應該是`3.8.2-0ubuntu2`
2. 如果都不行，就全部砍掉[^apt_remove_python]，語法如下，理論上應該就沒剩多少了，如果查看python會發現沒有這個command
```bash
$ sudo apt-get remove --auto-remove python3.10
$ sudo apt-get remove --auto-remove python3.
$ dpkg -l|grep python
```
3. 此時應該就可以正常安裝了`$ ./setup.sh`.
## Problem II
```bash
$ gdb
GNU gdb (Ubuntu 12.0.90-0ubuntu1) 12.0.90
Copyright (C) 2022 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Traceback (most recent call last):
File "/home/sbk6401/pwndbg/gdbinit.py", line 68, in <module>
import pwndbg # noqa: F401
File "/home/sbk6401/pwndbg/pwndbg/__init__.py", line 9, in <module>
import pwndbg.commands
File "/home/sbk6401/pwndbg/pwndbg/commands/__init__.py", line 17, in <module>
from pwndbg.heap.ptmalloc import DebugSymsHeap
File "/home/sbk6401/pwndbg/pwndbg/heap/ptmalloc.py", line 19, in <module>
import pwndbg.disasm
File "/home/sbk6401/pwndbg/pwndbg/disasm/__init__.py", line 13, in <module>
import capstone
File "/home/sbk6401/pwndbg/.venv/lib/python3.8/site-packages/capstone/__init__.py", line 326, in <module>
import distutils.sysconfig
ModuleNotFoundError: No module named 'distutils.sysconfig'
Reading symbols from chal...
(No debugging symbols found in chal)
Python Exception <class 'ModuleNotFoundError'>: No module named 'distutils.sysconfig'
(gdb)
```
碰到這個問題的前提是已經安裝好了(setup的部分完成)，那就直接安裝python3-distutils就好了
```bash
$ sudo apt-get install python3-distutils
```
## Problem III
如果是沒有`Pwngdb`的folder的話就直接拿已經安裝好的電腦，然後複製整個資料夾到`~/`就好了
## Problem IV
如果下gdb發現沒有使用任何plugin就要檢查.gdbinit的檔案怎麼寫，例如我的文件有gef和pwndbg，如果要使用其中一種，另外一個就要全部註解，才不會出錯
```bash
# source ~/.gdbinit-gef.py
#### gef
# gef setting
# gef config dereference.max_recursion 2
# gef config context.layout "regs code args source memory stack trace"
# gef config context.nb_lines_backtrace 3
# gef config context.redirect /dev/pts/1
#### pwndbg
source /home/sbk6401/pwndbg/gdbinit.py
source /home/sbk6401/Pwngdb/pwngdb.py
source /home/sbk6401/Pwngdb/angelheap/gdbinit.py
define hook-run
python
import angelheap
angelheap.init_angelheap()
end
end
```
---
到最後安裝的結果就會如下
:::spoiler Complete Result
```bash
$ dpkg -l|grep python
ii libpython3-dev:amd64 3.10.4-0ubuntu2 amd64 header files and a static library for Python (default)
ii libpython3-stdlib:amd64 3.10.4-0ubuntu2 amd64 interactive high-level object-oriented language (default python3 version)
ii libpython3.10:amd64 3.10.4-3 amd64 Shared Python runtime library (version 3.10)
ii libpython3.10-dev:amd64 3.10.4-3 amd64 Header files and a static library for Python (v3.10)
ii libpython3.10-minimal:amd64 3.10.4-3 amd64 Minimal subset of the Python language (version 3.10)
ii libpython3.10-stdlib:amd64 3.10.4-3 amd64 Interactive high-level object-oriented language (standard library, version 3.10)
ii libpython3.8:amd64 3.8.17-1+jammy1 amd64 Shared Python runtime library (version 3.8)
ii libpython3.8-dev:amd64 3.8.17-1+jammy1 amd64 Header files and a static library for Python (v3.8)
ii libpython3.8-minimal:amd64 3.8.17-1+jammy1 amd64 Minimal subset of the Python language (version 3.8)
ii libpython3.8-stdlib:amd64 3.8.17-1+jammy1 amd64 Interactive high-level object-oriented language (standard library, version 3.8)
ii python-apt-common 2.3.0ubuntu2 all Python interface to libapt-pkg (locales)
rc python-matplotlib-data 3.1.2-1ubuntu4 all Python based plotting system (data package)
ii python-pip-whl 20.0.2-5ubuntu1.9 all Python package installer
ii python3 3.10.4-0ubuntu2 amd64 interactive high-level object-oriented language (default python3 version)
ii python3-apt 2.3.0ubuntu2 amd64 Python 3 interface to libapt-pkg
ii python3-dev 3.10.4-0ubuntu2 amd64 header files and a static library for Python (default)
ii python3-distutils 3.10.4-0ubuntu1 all distutils package for Python 3.x
ii python3-lib2to3 3.10.4-0ubuntu1 all Interactive high-level object-oriented language (lib2to3)
ii python3-minimal 3.10.4-0ubuntu2 amd64 minimal subset of the Python language (default python3 version)
ii python3-pip 20.0.2-5ubuntu1.9 all Python package installer
ii python3-pkg-resources 59.6.0-1.2 all Package Discovery and Resource Access using pkg_resources
ii python3-setuptools 59.6.0-1.2 all Python3 Distutils Enhancements
ii python3-wheel 0.34.2-1ubuntu0.1 all built-package format for Python
ii python3.10 3.10.4-3 amd64 Interactive high-level object-oriented language (version 3.10)
ii python3.10-dev 3.10.4-3 amd64 Header files and a static library for Python (v3.10)
ii python3.10-minimal 3.10.4-3 amd64 Minimal subset of the Python language (version 3.10)
ii python3.8 3.8.17-1+jammy1 amd64 Interactive high-level object-oriented language (version 3.8)
ii python3.8-dev 3.8.17-1+jammy1 amd64 Header files and a static library for Python (v3.8)
ii python3.8-minimal 3.8.17-1+jammy1 amd64 Minimal subset of the Python language (version 3.8)
rc python3.8-venv 3.8.17-1+jammy1 amd64 Interactive high-level object-oriented language (pyvenv binary, version 3.8)
$ gdb
GNU gdb (Ubuntu 12.0.90-0ubuntu1) 12.0.90
Copyright (C) 2022 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
pwndbg: loaded 146 pwndbg commands and 47 shell commands. Type pwndbg [--shell | --all] [filter] for a list.
pwndbg: created $rebase, $ida GDB functions (can be used with print/break)
Reading symbols from chal...
(No debugging symbols found in chal)
------- tip of the day (disable with set show-tips off) -------
Pwndbg context displays where the program branches to thanks to emulating few instructions into the future. You can disable this with set emulate off which may also speed up debugging
pwndbg>
```
:::
## Reference
[^apt_remove_python]:[uninstall_python3](https://gist.github.com/zhensongren/811dcf2471f663ed3148a272f1faa957)
[^alter_python_version_on_ubuntu]:[Installing multiple alternative versions of Python on Ubuntu 20.04](https://towardsdatascience.com/installing-multiple-alternative-versions-of-python-on-ubuntu-20-04-237be5177474)
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