无法在Ubuntu上启动cassandra服务？

Question

我收到此输出错误：

library(dplyr)
library(ggplot2)

# Solves Problem 3 - create helper column width
mData <- mData %>%
  group_by(DayNum) %>%
  mutate(width = 1.5 * n())

Mypd <- position_dodge(width = 0.2)

ggplot(data = mData, 
       mapping = aes(x = DayNum, 
                     y = dMean, 
                     color = GroupID, 
                     shape = GroupID,
                     width = width)) + # map width column to width aesthetic
  geom_line(position = Mypd) +
  geom_point(position = Mypd, 
             size = 2) +
  # width is inherited from the above mapping, no need to map it again
  geom_errorbar(aes(ymin = dMean - mData$dStdDev, 
                    ymax = dMean + mData$dStdDev), 
                position = Mypd) +
  labs(y = bquote(bold("Volume " ~ (mm ^ 3)))) + # Solves Problem 1
  # Solves Problem 2:
  scale_colour_manual(name = "Group ID", values = c("Grp1" = "blue",
                                                    "Grp2" = "red",
                                                    "Grp3" = "green")) +
  scale_shape_manual(name = "Group ID", values = c("Grp1" = 15,
                                                   "Grp2" = 16,
                                                   "Grp3" = 17)) +
  theme_bw()

Answer 1

我通过切换到Java版本8解决了这个问题。 使用Java 9、10或其他版本时，目前唯一的解决方法是使用openjdk-8-jre软件包。