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Shourya Shikhar's questions

Martin Hope
Shourya Shikhar
Asked: 2022-05-23 06:30:42 +0800 CST
  • 1

在将我的系统从 Fedora 35 升级到 Fedora 36 时，我首先运行

sudo dnf upgrade --refresh

接着，

sudo dnf system-upgrade download --releasever=36

但它引起了这个错误：

Before you continue ensure that your system is fully upgraded by running "dnf --refresh upgrade". Do you want to continue [y/N]: y
Copr repo for spotify-tui owned by atim         1.7 kB/s | 3.3 kB     00:01    
Copr repo for PyCharm owned by phracek          2.5 kB/s | 3.6 kB     00:01    
created by dnf config-manager from https://brav  21 kB/s | 3.3 kB     00:00    
created by dnf config-manager from https://brav 120 kB/s | 9.2 kB     00:00    
Docker CE Stable - x86_64                        22 kB/s | 3.5 kB     00:00    
determining the fastest mirror (10 hosts).. done.--  B/s |   0  B     --:-- ETA
Fedora 36 - x86_64                              2.0 kB/s | 5.6 kB     00:02    
Fedora 36 openh264 (From Cisco) - x86_64        1.1 kB/s | 989  B     00:00    
Fedora Modular 36 - x86_64                      7.8 kB/s | 5.5 kB     00:00    
Fedora 36 - x86_64 - Updates                    7.5 kB/s | 5.5 kB     00:00    
Fedora 36 - x86_64 - Updates                    1.2 MB/s | 4.0 MB     00:03    
Fedora Modular 36 - x86_64 - Updates            4.2 kB/s | 5.4 kB     00:01    
packages for the GitHub CLI                     9.6 kB/s | 3.0 kB     00:00    
google-chrome                                   4.9 kB/s | 1.3 kB     00:00    
google-chrome                                   6.8 kB/s | 3.6 kB     00:00    
MEGAsync                                        1.1 kB/s | 1.5 kB     00:01    
pgadmin4                                         82  B/s | 146  B     00:01    
Errors during downloading metadata for repository 'pgAdmin4':
  - Status code: 404 for https://ftp.postgresql.org/pub/pgadmin/pgadmin4/yum/fedora/fedora-36-x86_64/repodata/repomd.xml (IP: 87.238.57.227)
Error: Failed to download metadata for repo 'pgAdmin4': Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried
PostgreSQL common RPMs for Fedora 36 - x86_64   115  B/s | 195  B     00:01    
PostgreSQL common RPMs for Fedora 36 - x86_64    76 kB/s | 231 kB     00:03    
PostgreSQL 14 for Fedora 36 - x86_64             83  B/s | 195  B     00:02    
PostgreSQL 14 for Fedora 36 - x86_64             49 kB/s | 177 kB     00:03    
PostgreSQL 13 for Fedora 36 - x86_64             99  B/s | 195  B     00:01    
PostgreSQL 13 for Fedora 36 - x86_64             46 kB/s | 175 kB     00:03    
PostgreSQL 12 for Fedora 36 - x86_64            105  B/s | 195  B     00:01    
PostgreSQL 12 for Fedora 36 - x86_64             66 kB/s | 168 kB     00:02    
PostgreSQL 11 for Fedora 36 - x86_64             94  B/s | 195  B     00:02    
PostgreSQL 11 for Fedora 36 - x86_64             37 kB/s | 165 kB     00:04    
PostgreSQL 10 for Fedora 36 - x86_64             93  B/s | 195  B     00:02    
PostgreSQL 10 for Fedora 36 - x86_64             37 kB/s | 128 kB     00:03    
RPM Fusion for Fedora 36 - Free                 1.9 kB/s | 2.2 kB     00:01    
RPM Fusion for Fedora 36 - Free - Updates        11 kB/s |  10 kB     00:00    
RPM Fusion for Fedora 36 - Free - Updates        41 kB/s |  75 kB     00:01    
RPM Fusion for Fedora 36 - Nonfree - NVIDIA Dri  14 kB/s | 9.8 kB     00:00    
RPM Fusion for Fedora 36 - Nonfree - Steam       19 kB/s | 9.4 kB     00:00    
Sublime Text - x86_64 - Stable                  3.0 kB/s | 2.9 kB     00:00    
Visual Studio Code                              8.6 kB/s | 3.0 kB     00:00    
Visual Studio Code                              7.3 MB/s |  25 MB     00:03    
Ignoring repositories: pgAdmin4
no group 'arm-tools' from environment 'workstation-product-environment'
No match for group package "qgnomeplatform"
No match for group package "reiserfs-utils"
No match for group package "xorg-x11-drv-armsoc"
No match for group package "intel-media-driver"
No match for group package "authselect-compat"
No match for group package "google-noto-sans-syriac-estrangela-fonts"
No match for group package "google-noto-sans-syriac-eastern-fonts"
No match for group package "ubuntu-title-fonts"
No match for group package "khmer-os-fasthad-fonts"
No match for group package "libguestfs-tools"
No match for group package "mpir-devel"
No match for group package "bcm283x-firmware"
No match for group package "kanjistrokeorders-fonts"
No match for group package "polarsys-b612-sans-fonts"
No match for group package "yanone-tagesschrift-fonts"
No match for group package "google-noto-sans-tibetan-fonts"
No match for group package "cvsgraph"
No match for group package "drehatlas-xaporho-fonts"
No match for group package "google-noto-sans-syriac-western-fonts"
No match for group package "libusbx-devel"
No match for group package "culmus-shofar-fonts"
No match for group package "tlomt-junction-fonts"
No match for group package "vollkorn-fonts"
No match for group package "drehatlas-warender-bibliothek-fonts"
Error: 
 Problem: package VirtualBox-6.1-6.1.30_148432_fedora33-1.x86_64 requires libvpx.so.6()(64bit), but none of the providers can be installed
  - libvpx-1.10.0-2.fc35.x86_64 does not belong to a distupgrade repository
  - problem with installed package VirtualBox-6.1-6.1.30_148432_fedora33-1.x86_64
(try to add '--skip-broken' to skip uninstallable packages)

添加--skip-broken似乎并不能解决问题。我犯了同样的错误。试过跑步sudo dnf remove libvpx-1.10.0-2.fc35.x86_64。但这给出了另一个警告：

Error: 
 Problem: The operation would result in removing the following protected packages: gnome-shell
(try to add '--skip-broken' to skip uninstallable packages)

如何升级我的 Fedora 发行版？

upgrade fedora
Martin Hope
Shourya Shikhar
Asked: 2021-12-12 01:18:10 +0800 CST
  • 4

我需要创建一个空文件。所以我用了这个：

echo "" > file

然后当我像这样在我的程序中执行检查（如果文件为空）时，

if(file.content == '')
   do something

if 块永远不会执行。

当我使用 打开文件时nano file，文件中没有任何内容。我什至试过这样做print(file.content)，输出仍然是空的。

是什么导致了这个错误？我能做些什么来解决这个问题？

files echo
Martin Hope
Shourya Shikhar
Asked: 2021-10-25 09:58:12 +0800 CST
  • 0

我正在编写这个 bash shell 脚本：

#!/bin/bash

declare -i N
read N
for i in {1..$N}
do
  echo "Number: $i"
done

（我相信declare -i N使N整数）

但是在运行它时，我得到以下输出：

>vim new.sh
>chmod +x passgen.sh
>./passgen.sh
15
Number: {1..15}

在这里，我想从用户那里获取限制，然后运行循环。

bash shell