目的
apt upgradeを実行すると，もれなくmpdが壊れてしまうようなので実施しないほうがよい．apt updateは必要だが，apt upgradeは必要ないはず．（2021/05/10追記）
数ヶ月前に電源ブツ切りか何かをして起動しなくなったRaspberry Pi（初代のType B）上のVolumio2.0の再インストールを実施してみたものの，途中でsudo apt-get upgradeでエラーが発生していた．
いったんあきらめていたが，その解消方法について調べたら判明したのでそれを記載する．
結論
以下のエラー
Preparing to unpack .../firmware-ralink_1%3a0.43+rpi6_all.deb ...
Unpacking firmware-ralink (1:0.43+rpi6) over (20161130-4~deb8u1) ...
dpkg: error processing archive /var/cache/apt/archives/firmware-ralink_1%3a0.43+rpi6_all.deb (--unpack):
trying to overwrite '/lib/firmware/rt2661.bin', which is also in package firmware-misc-nonfree 20161130-4~deb8u1
Errors were encountered while processing:
/var/cache/apt/archives/firmware-ralink_1%3a0.43+rpi6_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
は，zamentur氏によるとfirmware-ralinkというパッケージが競合している（ホットスポット対応が関連している？）とのことで，以下の順に競合先のfirmware-linux-nonfreeを削除することによりエラーを取り除くことができた：
sudo dpkg -r firmware-ralink sudo apt remove firmware-linux-nonfree sudo apt update sudo apt full-upgrade
現象
使用するVolumio2.0のカーネルバージョンは
volumio@volumio:~$ uname -a Linux volumio 4.19.118+ #1311 Mon Apr 27 14:16:15 BST 2020 armv6l GNU/Linux
のとおり4.19.118で，sudo apt-get updateで一連のアップデートを実施したあとにsudo apt-get upgradeを行うと，必ず以下のエラーが発生していた*1：
volumio@volumio:~$ sudo apt-get upgrade
Reading package lists... 0%
Reading package lists... 100%
Reading package lists... Done
Building dependency tree... 0%
Building dependency tree... 0%
Building dependency tree... 25%
Building dependency tree... 50%
Building dependency tree... 50%
Building dependency tree... 53%
Building dependency tree... 59%
Building dependency tree... 65%
Building dependency tree... 71%
Building dependency tree... 77%
Building dependency tree... 84%
Building dependency tree... 91%
Building dependency tree... 97%
Building dependency tree
Reading state information... 0%
Reading state information... 3%
Reading state information... Done
Calculating upgrade... Done
The following packages will be upgraded:
firmware-ralink
1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/46.1 kB of archives.
After this operation, 110 kB of additional disk space will be used.
Do you want to continue? [Y/n]
debconf: delaying package configuration, since apt-utils is not installed
(Reading database ...
(Reading database ... 5%
(Reading database ... 10%
(Reading database ... 15%
(Reading database ... 20%
(Reading database ... 25%
(Reading database ... 30%
(Reading database ... 35%
(Reading database ... 40%
(Reading database ... 45%
(Reading database ... 50%
(Reading database ... 55%
(Reading database ... 60%
(Reading database ... 65%
(Reading database ... 70%
(Reading database ... 75%
(Reading database ... 80%
(Reading database ... 85%
(Reading database ... 90%
(Reading database ... 95%
(Reading database ... 100%
(Reading database ... 24834 files and directories currently installed.)
Preparing to unpack .../firmware-ralink_1%3a0.43+rpi6_all.deb ...
Unpacking firmware-ralink (1:0.43+rpi6) over (20161130-4~deb8u1) ...
dpkg: error processing archive /var/cache/apt/archives/firmware-ralink_1%3a0.43+rpi6_all.deb (--unpack):
trying to overwrite '/lib/firmware/rt2661.bin', which is also in package firmware-misc-nonfree 20161130-4~deb8u1
Errors were encountered while processing:
/var/cache/apt/archives/firmware-ralink_1%3a0.43+rpi6_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
Googleにて（いつもどおり）検索したところ，firmware-ralinkというパッケージが競合しているとのこと．zamentur氏がGitHubで類似の問題を指摘している．この指摘によれば
dpkg -r firmware-ralink apt remove firmware-linux-nonfree apt update apt full-upgrade
で修復できるということなので，実施したところ，無事にすべて問題は解決された感じになった：
volumio@volumio:~$ sudo dpkg -r firmware-ralink
(Reading database ...
(Reading database ... 5%
(Reading database ... 10%
(Reading database ... 15%
(Reading database ... 20%
(Reading database ... 25%
(Reading database ... 30%
(Reading database ... 35%
(Reading database ... 40%
(Reading database ... 45%
(Reading database ... 50%
(Reading database ... 55%
(Reading database ... 60%
(Reading database ... 65%
(Reading database ... 70%
(Reading database ... 75%
(Reading database ... 80%
(Reading database ... 85%
(Reading database ... 90%
(Reading database ... 95%
(Reading database ... 100%
(Reading database ... 24834 files and directories currently installed.)
Removing firmware-ralink (20161130-4~deb8u1) ...
volumio@volumio:~$ sudo apt remove firmware-linux-nonfree
Reading package lists... 0%
Reading package lists... 0%
Reading package lists... 17%
Reading package lists... Done
Building dependency tree... 0%
Building dependency tree... 0%
Building dependency tree... 0%
Building dependency tree... 50%
Building dependency tree... 50%
Building dependency tree... 58%
Building dependency tree... 72%
Building dependency tree... 86%
Building dependency tree... 100%
Building dependency tree
Reading state information... 0%
Reading state information... 3%
Reading state information... Done
Package 'firmware-linux-nonfree' is not installed, so not removed
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
volumio@volumio:~$ sudo apt update
0% [Working]
0% [Waiting for headers]
Hit http://archive.volumio.org jessie InRelease
0% [Working]
Hit http://archive.volumio.org jessie InRelease
0% [Working]
0% [InRelease gpgv 14.9 kB]
5% [Working]
5% [InRelease gpgv 22.9 kB] [Waiting for headers]
7% [Waiting for headers]
Hit http://archive.volumio.org jessie/main Sources
7% [Working]
7% [Sources 0 B] [Waiting for headers]
Hit http://archive.volumio.org jessie/contrib Sources
7% [Sources 0 B]
Hit http://archive.volumio.org jessie/non-free Sources
7% [Sources 0 B]
Hit http://archive.volumio.org jessie/rpi Sources
7% [Sources 0 B]
Hit http://archive.volumio.org jessie/main armhf Packages
7% [Sources 0 B]
Hit http://archive.volumio.org jessie/contrib armhf Packages
7% [Sources 0 B]
Hit http://archive.volumio.org jessie/non-free armhf Packages
7% [Sources 0 B]
Hit http://archive.volumio.org jessie/rpi armhf Packages
7% [Sources 0 B] [Waiting for headers]
7% [Sources 0 B] [Waiting for headers]
7% [Sources 35.4 MB] [Waiting for headers]
7% [Sources 35.4 MB] [Waiting for headers]
7% [Sources 35.4 MB] [Waiting for headers]
Hit http://archive.volumio.org jessie/main Sources
7% [Sources 35.4 MB] [Waiting for headers]
Hit http://archive.volumio.org jessie/ui Sources
7% [Sources 35.4 MB] [Waiting for headers]
7% [Sources 35.4 MB] [Waiting for headers]
Hit http://archive.volumio.org jessie/main armhf Packages
7% [Sources 35.4 MB] [Waiting for headers]
Hit http://archive.volumio.org jessie/ui armhf Packages
7% [Sources 35.4 MB] [Waiting for headers]
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7% [Sources 35.4 MB] [Waiting for headers]
7% [Sources 35.4 MB] [Waiting for headers]
Ign http://archive.volumio.org jessie/contrib Translation-en_GB
11% [Sources 35.4 MB] [Waiting for headers]
Ign http://archive.volumio.org jessie/contrib Translation-en
15% [Sources 35.4 MB]
Ign http://archive.volumio.org jessie/main Translation-en_GB
19% [Sources 35.4 MB] [Waiting for headers]
Ign http://archive.volumio.org jessie/main Translation-en
22% [Sources 35.4 MB] [Waiting for headers]
Ign http://archive.volumio.org jessie/non-free Translation-en_GB
26% [Sources 35.4 MB] [Waiting for headers]
Ign http://archive.volumio.org jessie/non-free Translation-en
30% [Sources 35.4 MB] [Waiting for headers]
100% [Waiting for headers]
100% [Sources 0 B] [Waiting for headers]
100% [Waiting for headers]
100% [Sources 0 B] [Waiting for headers]
Ign http://archive.volumio.org jessie/rpi Translation-en_GB
100% [Sources 457 kB] [Waiting for headers]
100% [Waiting for headers]
100% [Sources 0 B] [Waiting for headers]
100% [Waiting for headers]
100% [Packages 0 B] [Waiting for headers]
Ign http://archive.volumio.org jessie/rpi Translation-en
100% [Packages 0 B] [Waiting for headers]
Ign http://archive.volumio.org jessie/main Translation-en_GB
100% [Packages 0 B]
Ign http://archive.volumio.org jessie/main Translation-en
100% [Packages 0 B]
Ign http://archive.volumio.org jessie/ui Translation-en_GB
100% [Packages 0 B]
Ign http://archive.volumio.org jessie/ui Translation-en
100% [Packages 0 B]
100% [Packages 0 B]
100% [Packages 0 B]
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100% [Packages 50.1 MB] 5,686 kB/s 0s
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100% [Working]
100% [Packages 0 B]
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100% [Working]
Reading package lists... 0%
Reading package lists... 0%
Reading package lists... 1%
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Reading package lists... 15%
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Reading package lists... 50%
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Reading package lists... 99%
Reading package lists... Done
Building dependency tree... 0%
Building dependency tree... 0%
Building dependency tree... 1%
Building dependency tree... 50%
Building dependency tree... 50%
Building dependency tree... 58%
Building dependency tree... 71%
Building dependency tree... 85%
Building dependency tree... 99%
Building dependency tree
Reading state information... 0%
Reading state information... 3%
Reading state information... Done
All packages are up to date.
volumio@volumio:~$ sudo apt full-upgrade
Reading package lists... 0%
Reading package lists... 100%
Reading package lists... Done
Building dependency tree... 0%
Building dependency tree... 0%
Building dependency tree... 50%
Building dependency tree... 50%
Building dependency tree... 54%
Building dependency tree... 67%
Building dependency tree... 81%
Building dependency tree... 95%
Building dependency tree
Reading state information... 0%
Reading state information... 3%
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
改訂履歴
| # | 日付 | 内容 |
|---|---|---|
| 1 | 2021--05-10 | apt upgradeをするとmpdが壊れてしまうと思われる状況を記事冒頭に追記 |
