{"id":52259,"date":"2026-10-26T07:39:44","date_gmt":"2026-10-26T07:39:44","guid":{"rendered":"https:\/\/ubuntuhandbook.org\/?p=52259"},"modified":"2026-10-26T07:39:44","modified_gmt":"2026-10-26T07:39:44","slug":"transmission-4-1-4-released-how-to-fix-app-launch-deb-package-issue","status":"publish","type":"post","link":"https:\/\/ubuntuhandbook.org\/index.php\/2026\/10\/transmission-4-1-4-released-how-to-fix-app-launch-deb-package-issue\/","title":{"rendered":"Transmission 4.1.4 Released! How to Fix App Launch (DEB Package) Issue"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-thumbnail wp-image-43680\" src=\"https:\/\/ubuntuhandbook.org\/wp-content\/uploads\/2023\/02\/transmission-icon-250x250.webp\" alt=\"\" width=\"250\" height=\"250\" srcset=\"https:\/\/ubuntuhandbook.org\/wp-content\/uploads\/2023\/02\/transmission-icon-250x250.webp 250w, https:\/\/ubuntuhandbook.org\/wp-content\/uploads\/2023\/02\/transmission-icon-300x300.webp 300w, https:\/\/ubuntuhandbook.org\/wp-content\/uploads\/2023\/02\/transmission-icon-600x600.webp 600w, https:\/\/ubuntuhandbook.org\/wp-content\/uploads\/2023\/02\/transmission-icon-768x768.webp 768w, https:\/\/ubuntuhandbook.org\/wp-content\/uploads\/2023\/02\/transmission-icon.webp 1200w\" sizes=\"auto, (max-width: 250px) 100vw, 250px\" \/><\/p>\n<p>Transmission, the free open-source BitTorrent client for Linux, Windows, and macOS, released new 4.1.4 version a few days ago.<\/p>\n<p>The new version is a bug-fix release that introduced various security and other small fixes.<\/p>\n<p><!--more--><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-52260\" src=\"https:\/\/ubuntuhandbook.org\/wp-content\/uploads\/2026\/10\/transmission414-700x461.webp\" alt=\"\" width=\"610\" height=\"402\" srcset=\"https:\/\/ubuntuhandbook.org\/wp-content\/uploads\/2026\/10\/transmission414-700x461.webp 700w, https:\/\/ubuntuhandbook.org\/wp-content\/uploads\/2026\/10\/transmission414-300x198.webp 300w, https:\/\/ubuntuhandbook.org\/wp-content\/uploads\/2026\/10\/transmission414-768x506.webp 768w, https:\/\/ubuntuhandbook.org\/wp-content\/uploads\/2026\/10\/transmission414.webp 885w\" sizes=\"auto, (max-width: 610px) 100vw, 610px\" \/><\/p>\n<p>Transmission 4.1.4 unified launch and delegation between the Qt and GTK clients. <b>When either client is running, you won&#8217;t be able to launch the other client!<\/b><\/p>\n<p>For example, when the Transmission GTK client is running, the Qt client won&#8217;t launch from the app launcher. If you try to open a torrent file with the Qt client, it will fall back to the already-running GTK client.<\/p>\n<p>However, due to this change, Transmission GTK and Qt client installed either from source or native DEB package won&#8217;t launch in Ubuntu 26.04 and 26.10 due to AppArmor permission. See the &#8220;How to Install&#8221; section below to workaround.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-52261\" src=\"https:\/\/ubuntuhandbook.org\/wp-content\/uploads\/2026\/10\/transmission-launchlock.webp\" alt=\"\" width=\"622\" height=\"90\" srcset=\"https:\/\/ubuntuhandbook.org\/wp-content\/uploads\/2026\/10\/transmission-launchlock.webp 622w, https:\/\/ubuntuhandbook.org\/wp-content\/uploads\/2026\/10\/transmission-launchlock-300x43.webp 300w\" sizes=\"auto, (max-width: 622px) 100vw, 622px\" \/><\/p>\n<p>Besides this change, it also fixed a potential RCE vulnerability in the macOS client.<\/p>\n<p>And, it now protects against malformed RPC requests by validating torrent-priority arguments before processing them, preventing invalid indices from causing out-of-bounds memory access.<\/p>\n<p>The Qt client has been improved to use less CPU. The GTK client&#8217;s torrent list now re-sorts and reapplies filters when a torrent&#8217;s name changes. And, the macOS client raised its minimum requirement to macOS 12.0.<\/p>\n<p>Other changes are mostly bug-fixes. They include:<\/p>\n<ul>\n<li>Fix regression that could cause torrents with zero-byte files to be handled incorrectly.<\/li>\n<li>Migrate Sparkle update signing from DSA to EdDSA.<\/li>\n<li>Fix GTK client app icon not found on some desktops.<\/li>\n<li>Update zlib and Qt versions in Windows build.<\/li>\n<li>Fix web client display issue that sometimes listed torrent names as &#8216;Unknown&#8217;.<\/li>\n<\/ul>\n<h3>How to Install Transmission 4.1.4<\/h3>\n<p>More changes about the release, as well as the source tarball, Windows and macOS packages are available in Github via the link below:<\/p>\n<div class=\"wp-block-buttons aligncenter\">\n<div class=\"wp-block-button is-style-fill\"><a class=\"wp-block-button__link has-vivid-cyan-blue-to-vivid-purple-gradient-background has-text-color has-background\" href=\"https:\/\/github.com\/transmission\/transmission\/releases\/tag\/4.1.4\" target=\"_blank\" rel=\"noreferrer noopener\">Get Transmission 4.1.4<\/a><\/div>\n<\/div>\n<p>For Linux, besides building from source or waiting for your distribution updates, user can also choose install the community maintained <a href=\"https:\/\/flathub.org\/en\/apps\/com.transmissionbt.Transmission\" target=\"_blank\" rel=\"noopener\">Flatpak package<\/a>, which runs in sandbox.<\/p>\n<p>There&#8217;s also <a href=\"https:\/\/snapcraft.io\/transmission\" target=\"_blank\" rel=\"noopener\">snap package<\/a> that&#8217;s available to install in Ubuntu App Center (or Ubuntu Software), which however is not updated at the moment of writing.<\/p>\n<p>For Ubuntu 22.04, Ubuntu 24.04, Ubuntu 26.04 and 26.10, I&#8217;ve built the native DEB package into <a href=\"https:\/\/launchpad.net\/~ubuntuhandbook1\/+archive\/ubuntu\/transmission\" target=\"_blank\" rel=\"noopener\">this PPA<\/a>.<\/p>\n<p>Simply press Ctrl+Alt+T to open terminal, and run commands below one by one to add PPA and install the package:<\/p>\n<pre>sudo add-apt-repository ppa:ubuntuhandbook1\/transmission<\/pre>\n<pre>sudo apt update<\/pre>\n<pre>sudo apt install transmission<\/pre>\n<p><b>To fix the app launch issue<\/b> in Ubuntu 26.04\/26.10, open terminal and run command:<\/p>\n<pre>sudo nano \/etc\/apparmor.d\/local\/transmission<\/pre>\n<p>The command will open (create if does not exist) a local override for AppArmor&#8217;s Transmission profile. When file opens, paste the lines below:<\/p>\n<pre># Allow Transmission GTK to lock its configuration files.\r\nowner @{HOME}\/.config\/transmission\/** k,<\/pre>\n<p>Then, press <b>Ctrl+S<\/b> to save and <b>Ctrl+X<\/b> to exit. It grants the owner (usually yourself) file-locking operations to files under <code>.config\/transmission<\/code> directory, needed to prevent running GTK &amp; Qt clients at the same time.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-52262\" src=\"https:\/\/ubuntuhandbook.org\/wp-content\/uploads\/2026\/10\/apparmor-transmissionlock-700x519.webp\" alt=\"\" width=\"610\" height=\"452\" srcset=\"https:\/\/ubuntuhandbook.org\/wp-content\/uploads\/2026\/10\/apparmor-transmissionlock-700x519.webp 700w, https:\/\/ubuntuhandbook.org\/wp-content\/uploads\/2026\/10\/apparmor-transmissionlock-300x222.webp 300w, https:\/\/ubuntuhandbook.org\/wp-content\/uploads\/2026\/10\/apparmor-transmissionlock-768x569.webp 768w, https:\/\/ubuntuhandbook.org\/wp-content\/uploads\/2026\/10\/apparmor-transmissionlock.webp 781w\" sizes=\"auto, (max-width: 610px) 100vw, 610px\" \/><\/p>\n<p>Finally, reload the AppArmor profile to apply change.<\/p>\n<pre>sudo apparmor_parser -r \/etc\/apparmor.d\/transmission<\/pre>","protected":false},"excerpt":{"rendered":"<p>Transmission, the free open-source BitTorrent client for Linux, Windows, and macOS, released new 4.1.4 version a few days ago. The new version is a bug-fix release that introduced various security and other small fixes.<\/p>\n","protected":false},"author":1,"featured_media":43680,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[1081],"class_list":["post-52259","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-howtos","tag-transmission"],"_links":{"self":[{"href":"https:\/\/ubuntuhandbook.org\/index.php\/wp-json\/wp\/v2\/posts\/52259","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ubuntuhandbook.org\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ubuntuhandbook.org\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ubuntuhandbook.org\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ubuntuhandbook.org\/index.php\/wp-json\/wp\/v2\/comments?post=52259"}],"version-history":[{"count":0,"href":"https:\/\/ubuntuhandbook.org\/index.php\/wp-json\/wp\/v2\/posts\/52259\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ubuntuhandbook.org\/index.php\/wp-json\/wp\/v2\/media\/43680"}],"wp:attachment":[{"href":"https:\/\/ubuntuhandbook.org\/index.php\/wp-json\/wp\/v2\/media?parent=52259"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ubuntuhandbook.org\/index.php\/wp-json\/wp\/v2\/categories?post=52259"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ubuntuhandbook.org\/index.php\/wp-json\/wp\/v2\/tags?post=52259"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}