我正在使用 Kubuntu 的升级版本，从 16.04 到 17.04，然后到 17.10。
当尝试在应用程序菜单的搜索字段中输入某些内容时krunner- 字母不会按输入的方式显示。
有时，字母在输入多次后才会出现。
但 Konsole 或浏览器，甚至文本编辑器都不会受到影响，只有搜索字段krunner和应用程序菜单才会受到影响。
更新：经过一段时间（以及几次更新）后，更多输入字段开始出现异常：
- 网络管理器中的密码输入字段
- 在应用程序启动器中搜索
系统详细信息：
联想 X1 Carbon Gen 3
输出qtdiag：
Qt 5.9.1 (x86_64-little_endian-lp64 shared (dynamic) release build; by GCC 7.2.0) on "xcb"
OS: Ubuntu 17.10 [linux version 4.13.0-32-generic]
Architecture: x86_64; features: SSE2 SSE3 SSSE3 SSE4.1 SSE4.2 AVX AVX2 RTM HLE
Environment:
QT4_IM_MODULE="ibus"
QT_ACCESSIBILITY="1"
QT_AUTO_SCREEN_SCALE_FACTOR="0"
QT_IM_MODULE="ibus"
QT_QPA_PLATFORMTHEME="appmenu-qt5"
QT_QUICK_CONTROLS_STYLE="org.kde.desktop"
Features: QT_NO_EXCEPTIONS
Library info:
PrefixPath: /usr
DocumentationPath: /usr/share/qt5/doc
HeadersPath: /usr/include/x86_64-linux-gnu/qt5
LibrariesPath: /usr/lib/x86_64-linux-gnu
LibraryExecutablesPath: /usr/lib/x86_64-linux-gnu/qt5/libexec
BinariesPath: /usr/lib/x86_64-linux-gnu/qt5/bin
PluginsPath: /usr/lib/x86_64-linux-gnu/qt5/plugins
ImportsPath: /usr/lib/x86_64-linux-gnu/qt5/imports
Qml2ImportsPath: /usr/lib/x86_64-linux-gnu/qt5/qml
ArchDataPath: /usr/lib/x86_64-linux-gnu/qt5
DataPath: /usr/share/qt5
TranslationsPath: /usr/share/qt5/translations
ExamplesPath: /usr/lib/x86_64-linux-gnu/qt5/examples
TestsPath: /usr/tests
SettingsPath: /etc/xdg
Standard paths [*...* denote writable entry]:
DesktopLocation: "Desktop" */home/USERNAME/Desktop*
DocumentsLocation: "Documents" */home/USERNAME/Documents*
FontsLocation: "Fonts" */home/USERNAME/.local/share/fonts* /home/USERNAME/.fonts
ApplicationsLocation: "Applications" */home/USERNAME/.local/share/applications* /usr/share/usr/share/xsessions/plasma/applications /usr/local/share/applications /usr/share/applications /var/lib/snapd/desktop/applications
MusicLocation: "Music" */home/USERNAME/Music*
MoviesLocation: "Movies" */home/USERNAME/Videos*
PicturesLocation: "Pictures" */home/USERNAME/Pictures*
TempLocation: "Temporary Directory" */tmp*
HomeLocation: "Home" */home/USERNAME*
AppLocalDataLocation: "Application Data" */home/USERNAME/.local/share/QtProject/qtdiag* /usr/share/usr/share/xsessions/plasma/QtProject/qtdiag /usr/local/share/QtProject/qtdiag /usr/share/QtProject/qtdiag /var/lib/snapd/desktop/QtProject/qtdiag
CacheLocation: "Cache" */home/USERNAME/.cache/QtProject/qtdiag*
GenericDataLocation: "Shared Data" */home/USERNAME/.local/share* /usr/share/usr/share/xsessions/plasma /usr/local/share /usr/share /var/lib/snapd/desktop
RuntimeLocation: "Runtime" */run/user/1000*
ConfigLocation: "Configuration" */home/USERNAME/.config* /etc/xdg/xdg-/usr/share/xsessions/plasma /etc/xdg/xdg-/usr/share/xsessions/plasma /etc/xdg /usr/share/kubuntu-default-settings/kf5-settings
DownloadLocation: "Download" */home/USERNAME/Downloads*
GenericCacheLocation: "Shared Cache" */home/USERNAME/.cache*
GenericConfigLocation: "Shared Configuration" */home/USERNAME/.config* /etc/xdg/xdg-/usr/share/xsessions/plasma /etc/xdg/xdg-/usr/share/xsessions/plasma /etc/xdg /usr/share/kubuntu-default-settings/kf5-settings
AppDataLocation: "Application Data" */home/USERNAME/.local/share/QtProject/qtdiag* /usr/share/usr/share/xsessions/plasma/QtProject/qtdiag /usr/local/share/QtProject/qtdiag /usr/share/QtProject/qtdiag /var/lib/snapd/desktop/QtProject/qtdiag
AppConfigLocation: "Application Configuration" */home/USERNAME/.config/QtProject/qtdiag* /etc/xdg/xdg-/usr/share/xsessions/plasma/QtProject/qtdiag /etc/xdg/xdg-/usr/share/xsessions/plasma/QtProject/qtdiag /etc/xdg/QtProject/qtdiag /usr/share/kubuntu-default-settings/kf5-settings/QtProject/qtdiag
File selectors (increasing order of precedence):
en_US unix linux ubuntu
Network:
Using "OpenSSL 1.0.2g 1 Mar 2016", version: 0x1000207f
Platform capabilities: ThreadedPixmaps OpenGL WindowMasks MultipleWindows ForeignWindows NonFullScreenWindows NativeWidgets WindowManagement SyncState RasterGLSurface SwitchableWidgetComposition
Style hints:
mouseDoubleClickInterval: 300
mousePressAndHoldInterval: 800
startDragDistance: 4
startDragTime: 300
startDragVelocity: 0
keyboardInputInterval: 400
keyboardAutoRepeatRate: 30
cursorFlashTime: 1000
showIsFullScreen: 0
showIsMaximized: 0
passwordMaskDelay: 0
passwordMaskCharacter: U+25CF
fontSmoothingGamma: 1.7
useRtlExtensions: 0
setFocusOnTouchRelease: 0
tabFocusBehavior: Qt::TabFocusBehavior(TabFocusAllControls)
singleClickActivation: 0
Additional style hints (QPlatformIntegration):
ReplayMousePressOutsidePopup: 0
Theme:
Platforms requested : kde,generic
available : kde,gtk3
Styles requested : oxygen,breeze,fusion,windows
available : Breeze,Oxygen,Windows,Fusion
Icon theme : breeze, hicolor from /home/USERNAME/.icons,/usr/share/icons
System font : "Noto Sans" 12
Fonts:
General font : "Noto Sans" 12
Fixed font : "Hack" 9
Title font : "Noto Sans" 12
Smallest font: "Noto Sans" 8
Palette:
WindowText: #ff31363b
Button: #ffeff0f1
Light: #ffffffff
Midlight: #fff7f7f8
Dark: #ff888e93
Mid: #ffc4c9cd
Text: #ff31363b
BrightText: #ffffffff
ButtonText: #ff31363b
Base: #fffcfcfc
Window: #ffeff0f1
Shadow: #ff474a4c
Highlight: #ff3daee9
HighlightedText: #ffeff0f1
Link: #ff2980b9
LinkVisited: #ff7f8c8d
AlternateBase: #ffeff0f1
NoRole: #ff000000
ToolTipBase: #ff31363b
ToolTipText: #ffeff0f1
Screens: 1, High DPI scaling: inactive
# 0 "eDP-1" Depth: 24 Primary: yes
Manufacturer:
Model:
Serial number:
Geometry: 2560x1440+0+0 Available: 2560x1384+0+0
Physical size: 310x170 mm Refresh: 59 Hz Power state: 0
Physical DPI: 209.755,215.153 Logical DPI: 120,120 Subpixel_None
DevicePixelRatio: 1 Pixel density: 2
Primary orientation: 2 Orientation: 2 Native orientation: 0 OrientationUpdateMask: 0
Touch devices: 1
TouchPad "SynPS/2 Synaptics TouchPad", max 1 touch points, capabilities: Pressure MouseEmulation
LibGL Vendor: Intel Open Source Technology Center
Renderer: Mesa DRI Intel(R) HD Graphics 520 (Skylake GT2)
Version: 3.0 Mesa 17.2.8
Shading language: 1.30
Format: Version: 3.0 Profile: 0 Swap behavior: 0 Buffer size (RGB): 8,8,8
答案1
这联想 X1 Carbon 第三代计算机应该有足够的马力来运行 Kubuntu :-)
我怀疑升级导致了一些不匹配。请尝试实时系统，如果运行正常，请备份您的个人文件并进行全新安装。
请参阅以下链接（以及来自该链接的链接），
在安装之前先试用 Ubuntu（Kubuntu、Lubuntu、Xubuntu 等）
编辑：
如果您在从 16.04.3 iso 文件启动时遇到问题（可能在更新和升级后出现），您可以尝试从 16.04.1 iso 文件启动，您可以通过此链接找到该文件（向下滚动...），
cdimage.ubuntu.com/kubuntu/releases/16.04.1/release/
当您从 16.04.1 iso 文件启动时，内核将停留在 linux 4.4 内核系列中，即“xenial 内核”。
您也可以尝试最新版本 17.10.1
http://cdimage.ubuntu.com/kubuntu/releases/17.10.1/release/
或者仍在开发中的“仿生”版本，将于 2018 年 4 月作为下一个版本发布并提供长期支持。这可能运行良好，但有点冒险，因为许多东西仍处于开发阶段，可能会出现暂时的错误。